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2023 Top 100 Audubon Photos | Trish Oster’s Peregrines
[Posted by Chuck Almdale]
Link to 2023 National Audubon Society winners.
The best 100 of almost 9,000 entries.
Clear, sharp, well-framed, interesting, unusual views, unusual behaviors, unusual angles.
Among the 100 top photos is #82 by Trish Oster, local bird photographer who occasionally joins us on our Malibu Lagoon bird walks. I had the chance to talk to her recently and she sent me a copy of this and a few other photos I’ll be posting in the near future. I had to reduce it in file size from 3329 Kb to 570 Kb to get it onto our site, so there probably is a slight degradation in quality and it’s not as large as on the NAS site.

Trish says:
This is my photo that made it into the 2023 Audubon Top 100. It is of 2 juvenile Peregrine Falcons. They had just fledged and the bird on the left was flapping its wings and kept hitting its sibling in the head, which perturbed the youngster as you can see its expression in the photo!
This particular female (Maxine) is around 10 years old now.
She arrived quite a few years ago and killed the resident female. We do not know where she came from.
The father to these chicks was banded 02Z, and nicknamed “two zee,” locally spelled “Tuzee.” If I remember correctly, I believe his tag indicated he was from the Portland Oregon area and he was around 13 years old. My photo is from June 2023.

02Z disappeared last year while the 2 new chicks had just gotten old enough to fly around a little. He never returned and was determined to have died. There have also been reports that he was found dead and had been attacked and killed.
Maxine raised the two chicks all by herself. Catching prey and feeding them and fending off attacks from male Peregrines trying to take over and kill the chicks. The two chicks fledged successfully.
The NAS website has the following photo information:
Category: Amateur
Location: Point Fermin, San Pedro, California
Camera: Canon EOS R6 with a Canon RF100-500mm f/4.5-7.1 L IS USM lens;
1/2000 second at f/7.1; ISO 5000>
Behind the Shot: I took this photo when three Peregrine Falcon fledglings I watched were still working on their flight skills. The young falcon on the left stretched and flapped its wings, getting the courage up to take flight. The morning was overcast, which I prefer for photography, as I feel it creates a softer look to my photos. I upped my shutter speed a little higher to compensate for the wing movement and in expectation for the suspected takeoff. (Which happened two frames later!) When I snapped the photo, the falcon on the right looked straight at me. I often wonder how these fledglings are faring. Getting the opportunity to photograph them was a magical experience.
No June Gloom at Malibu Lagoon, 22 June 2025

[By Chuck Almdale; Photos by Ray Juncosa & Chris Tosdevin]
It wasn’t the first bird of the day, but whenever a Peregrine Falcon comes rocketing across the lagoon towards the shorebirds and ducks, it’s an event. There wasn’t a lot of potential prey that looked interesting, I suppose, as after that brief pass, the bird continued past Malibu Pier and on down the coast.

As always when looking sunward, the plumage colors were indistinct and gray, and I could not see the dark hood at all, nevertheless the size and bulk cried Peregrine. After seeing Chris’s photos which show the dark hood far more clearly, I decided that of the three Peregrine subspecies – anatum (Continental), pealei (Peale’s) and tundrius (Tundra), pealei was the most likely, based on the width of the dark moustachial mark, the small pale auricular area behind it and the overall darkness and streaking of the plumage. Pealei breeds from the Olympic Penn. up through the Aleutians.
Since Dec. 24, 2000, we’ve seen 43 Peregrines in 40 sightings at the lagoon (we’ve had a pair of them three times, most recently Apr 28, 2019), and overall they show up on 15% of our visits since the beginning of 2010 (no visits at all for 1979-1999). This is surprisingly frequent it seems to me, but then again, if they’re here they will be seen, as they don’t hide in the bushes like Lincoln’s Sparrows.

The above screen-snip from my lagoon spreadsheet shows the record for visiting falcons: Peregrines have appeared every month except August, only one previously in June. Not a lot of Prairie Falcon visits as you can see.
In terms of species variety and sheer numbers (or lack thereof), “June is the cruelest month” for birders in SoCal. Words to live by. Of our mere 42 species today, many were lagoon locale breeding birds. Others bred nearby, such as Brown Pelicans on the Channel Islands. Killdeer nest on the sandy “dunes,” Hooded Oriole in the trees, especially palms, Bushtits in the trees or brush, Song Sparrows in the brush, Common Yellowthroat in the reeds or brush, Canada Geese on the sandy islands where the Mallard and Gadwall probably nest as well (they’re better at hiding than the long-necked geese).
All grebe species stay near water. As with loons, their legs are located far back on their torsos (their family name Podicipedidae means “rump-foot”) and they really can’t walk on land but only drag their body and lurch, so they build their nests in water on a mound of mud, reeds, and vegetation. At the lagoon we normally can’t see their nests (assuming they’re even there!) as they’re well-hidden in the reeds, but all the reeds have fallen over, possibly due to the very high lagoon water, and this grebe’s nest was revealed to all.

Canada Geese nested again at the lagoon for what looks like the 6th year in a row, always on the sandy brushy islands, one pair with three young (remaining) this year. The young are still slightly smaller than the adults and their plumage is still a bit scraggly.


I don’t know where the Black Phoebes nest. In my limited experience, they seem to prefer nesting over front-door porch lights. As they’re here 98% of the time, they’re nesting somewhere nearby.

It’s possible this Killdeer was born a few months ago. It looks very slender to me and the lower black breast-band was quite irregular.

Either this Willet was already finished with nesting (NE Calif. to Minnesota to southern Canadian plains) or didn’t bother to go, as it is quite well-marked on the breast. They’re here year-round , 88% of all visits, but least common May-July.

This young Brown Pelican was unfortunately quite well-oiled on the breast. Something, somewhere, is leaking.

The Pelican Pair’s Odyssey
It began with the pair trailing a Double-Crested Cormorant. Perhaps it’ll find a fish they can steal?

One stick, two young pelicans, a recipe for trouble. It begins to draw attention.

It begins to get a bit boisterous and mom or dad moves in.

But mom, or dad, snags it…

Sometimes mother Gadwall had nine ducklings, sometimes eleven, sometimes twelve.

We don’t have any photos, but we were all surprised to see Ruddy Ducks. Sometimes there were one, sometimes three, one of us thought four. I promised I’d look up June lagoon records for them.
Year-round for 12/1/79 – 6/22/25: 2,967 birds on 164 occasions.
June only: 16 birds total on 3 occasions, July only: 6 birds total on 3 occasions
November: 622 birds total on 26 occasions, December: 583 birds total on 27 occasions.
Present mostly Oct – March. Presence year-round 1/1/10 – present: 56%
So…we were right, Ruddys are rarely here in June. Prior sightings were 7 birds on 6/27/10 and 6 on 6/24/07.
We didn’t have a lot of gulls, only 102. Here’s three of the four species. The Heermann’s Gulls, like the adult below, have returned in small numbers from their nesting grounds on Isla Rasa in the Sea of Cortez.

The Caspian Tern Hydroprogne caspia is the largest tern in the world and has a “sub-cosmopolitan” distribution. It was first collected in 1770 near the Caspian Sea, adjacent to its largest breeding area, and described by Peter Simon Pallas. Pallas seems to have specialized in this region as Pallas’ Gull and Pallas’ Sandgrouse, obviously named for him, also nest adjacent to the Caspian Sea. Caspian Terns also nest in several locations in northern California and regularly visit the lagoon in small numbers. To date we’ve seen 1,168 birds on 155 visits, or 47% of visits. Presence is primarily March-August, peaking in April. The blood-red bill, usually with a dark tip, the dark cap and large size give it away.

Caspian Tern range: Orange: breeding; Yellow: migration; Purple: year round; Blue: non-breeding (wintering). Wikipedia

Oh no, we’ve reached the end, in recognition of which is this semi-snoozing waterfowl. What is it and why?

I wanted to mention the water level again. The lagoon outflow channel to the sea has silted in, and the lagoon water was quite high, higher than actual sea level which was at high tide at 8:24 am, and possibly higher than I’ve ever seen it before. The railing around the summer clock sidewalk barely emerged from the water, just like in last month’s photo.

According to the designers, for every inch of water level rise in the lagoon, the water moves four feet up the sidewalk. Tiles (see below) spaced along the sidewalk below the metal railing tell you the water height. Last month the water’s edge was a couple of feet to the right of this marker below. This month the marker was under 2″ of water. As the lagoon is closed to the ocean, this is lagoon water level only, fed solely by water coming down the creek; the level of the sea has almost nothing to do with it.

Not every lagoon in the world can claim to have it’s own water level marking system.
Malibu Lagoon on eBird as of 6-23-25: 8632 lists, 2768 eBirders, 321 species
Most recent new species seen: Nelson’s Sparrow, 11/29/24 by Femi Faminu (SMBAS member). When the newest species added to the list was seen on a date prior to the most recently seen new species, there is no way I can find to easily determine what that bird is. Another minor nit to pick about eBird.
Birds new for the season: Brant, Willet, Heermann’s Gull, Black-crowned Night Heron, Peregrine Falcon. “New for the season” means it has been three or more months since last recorded on our trips.
Many, many thanks to photographers Ray Juncosa & Chris Tosdevin.
Upcoming SMBAS scheduled field trips; no reservations or Covid card necessary unless specifically mentioned:
- Malibu Lagoon, Sun. July 27, 8:30 (adults) & 10 am (parents & kids)
- Lower Los Angeles River, Sat. Aug 9, 7am (to beat the heat) reservations
- Malibu Lagoon, Sun. August 24, 8:30 (adults) & 10 am (parents & kids)
- These and any other trips we announce for the foreseeable future will depend upon expected status of the Covid/flu/etc. pandemic, not to mention landslides, at trip time. Any trip announced may be canceled shortly before trip date if it seems necessary. By now any other comments should be superfluous.
- Link to Programs & Field Trip schedule.
The next SMBAS Zoom program: October 7, to be announced.
The SMBAS 10 a.m. Parent’s & Kids Birdwalk has again resumed. Reservations not necessary for families, but for groups (scouts, etc.), call Jean (213-522-0062).
Links: Unusual birds at Malibu Lagoon
9/23/02 Aerial photo of Malibu Lagoon
More recent aerial photo
Prior checklists:
2025: Jan-June
2023: Jan-June, July-Dec 2024: Jan-June, July-Dec
2021: Jan-July, July-Dec 2022: Jan-June, July-Dec
2020: Jan-July, July-Dec 2019: Jan-June, July-Dec
2018: Jan-June, July-Dec 2017: Jan-June, July-Dec
2016: Jan-June, July-Dec 2015: Jan-May, July-Dec
2014: Jan-July, July-Dec 2013: Jan-June, July-Dec
2012: Jan-June, July-Dec 2011: Jan-June, July-Dec
2010: Jan-June, July-Dec 2009: Jan-June, July-Dec
The 10-year comparison summaries created during the Lagoon Reconfiguration Project period, remain available—despite numerous complaints—on our Lagoon Project Bird Census Page. Very briefly summarized, the results unexpectedly indicate that avian species diversification and numbers improved slightly during the restoration period June’12-June’14.
Many thanks to Marie Barnidge-McIntyre & Chris Tosdevin for contributions made to this month’s census counts.
The species list below was re-sequenced as of 12/31/24 to agree with the California Bird Records Committee Official California Checklist. If part of the right side of the chart below is hidden, there’s a slider button inconveniently located at the bottom end of the list. The numbers 1-9 left of the species names are keyed to the nine categories of birds at the bottom. Updated lagoon bird check lists can be downloaded here.
[Chuck Almdale]
| Malibu Census 2025 | 1/30 | 2/23 | 3/23 | 4/27 | 5/25 | 6/22 | |
| Temperature | 57-59 | 57-70 | 54-64 | 56-64 | 63-68 | 66-73 | |
| Tide Lo/Hi Height | H+6.14 | H+4.79 | H+4.15 | H+4.29 | H+3.78 | H+3.31 | |
| Tide Time | 0913 | 0526 | 0433 | 0957 | 0909 | 0824 | |
| 1 | Brant (Black) | 1 | |||||
| 1 | Canada Goose | 2 | 2 | 8 | 1 | 5 | |
| 1 | Cinnamon Teal | 5 | 6 | ||||
| 1 | Northern Shoveler | 6 | |||||
| 1 | Gadwall | 89 | 9 | 35 | 10 | 24 | 25 |
| 1 | Mallard | 22 | 6 | 22 | 21 | 26 | 20 |
| 1 | Green-winged Teal | 5 | 16 | 6 | |||
| 1 | Lesser Scaup | 2 | |||||
| 1 | Surf Scoter | 15 | 6 | ||||
| 1 | Bufflehead | 23 | |||||
| 1 | Red-breasted Merganser | 12 | 8 | 3 | 1 | ||
| 1 | Ruddy Duck | 37 | 17 | 11 | 10 | 4 | 3 |
| 2 | Pied-billed Grebe | 4 | 7 | 8 | 4 | 4 | 4 |
| 2 | Eared Grebe | 1 | |||||
| 2 | Western Grebe | 34 | 30 | 30 | 25 | 4 | 2 |
| 7 | Feral Pigeon | 6 | 5 | 1 | 6 | 5 | |
| 7 | Mourning Dove | 1 | 2 | 2 | 1 | ||
| 8 | Anna’s Hummingbird | 3 | 3 | 3 | 1 | 1 | |
| 8 | Allen’s Hummingbird | 1 | 5 | 6 | 5 | 2 | 2 |
| 2 | American Coot | 797 | 45 | 55 | 11 | 4 | 1 |
| 5 | Black-bellied Plover | 30 | 30 | ||||
| 5 | Killdeer | 2 | 4 | 4 | 3 | 2 | 5 |
| 5 | Semipalmated Plover | 2 | |||||
| 5 | Snowy Plover | 2 | 2 | 3 | |||
| 5 | Whimbrel | 8 | 5 | 8 | 3 | ||
| 5 | Marbled Godwit | 3 | 2 | 8 | |||
| 5 | Ruddy Turnstone | 2 | 4 | ||||
| 5 | Sanderling | 22 | |||||
| 5 | Dunlin | 1 | |||||
| 5 | Least Sandpiper | 7 | 14 | 5 | 1 | ||
| 5 | Western Sandpiper | 16 | 34 | ||||
| 5 | Spotted Sandpiper | 1 | 1 | 1 | |||
| 5 | Willet | 15 | 8 | 10 | 1 | ||
| 5 | Greater Yellowlegs | 2 | |||||
| 6 | Heermann’s Gull | 7 | 1 | 13 | |||
| 6 | Ring-billed Gull | 12 | 12 | 6 | 2 | 3 | 5 |
| 6 | Western Gull | 90 | 55 | 20 | 20 | 70 | 79 |
| 6 | California Gull | 575 | 105 | 1 | 2 | 82 | 5 |
| 6 | American Herring Gull | 1 | 2 | 1 | |||
| 6 | Glaucous-winged Gull | 3 | 1 | ||||
| 6 | Caspian Tern | 11 | 2 | 6 | 4 | ||
| 6 | Royal Tern | 5 | 10 | ||||
| 6 | Elegant Tern | 2 | |||||
| 2 | Red-throated Loon | 1 | |||||
| 2 | Pacific Loon | 1 | 1 | 1 | |||
| 2 | Common Loon | 4 | 10 | ||||
| 2 | Brandt’s Cormorant | 7 | 1 | 5 | 12 | ||
| 2 | Pelagic Cormorant | 2 | 1 | ||||
| 2 | Double-crested Cormorant | 55 | 25 | 25 | 25 | 7 | 18 |
| 2 | American White Pelican | 5 | |||||
| 2 | Brown Pelican | 23 | 29 | 200 | 25 | 157 | 138 |
| 3 | Snowy Egret | 5 | 6 | 5 | 1 | 2 | 1 |
| 3 | Black-crowned Night-Heron | 1 | 4 | ||||
| 3 | Great Egret | 1 | 2 | 2 | 1 | 1 | 3 |
| 3 | Western Cattle-Egret | 1 | |||||
| 3 | Great Blue Heron | 1 | 2 | 1 | 1 | 9 | |
| 4 | Turkey Vulture | 2 | |||||
| 4 | Osprey | 2 | 1 | 1 | 1 | ||
| 4 | Cooper’s Hawk | 1 | 1 | ||||
| 4 | Bald Eagle | 1 | |||||
| 4 | Red-shouldered Hawk | 1 | |||||
| 4 | Red-tailed Hawk | 1 | 1 | 1 | 1 | ||
| 8 | Belted Kingfisher | 1 | 1 | ||||
| 8 | Nuttall’s Woodpecker | 1 | |||||
| 4 | Peregrine Falcon | 1 | |||||
| 8 | Nanday Parakeet | 4 | 2 | 2 | |||
| 9 | Cassin’s Kingbird | 1 | 1 | 1 | |||
| 9 | Black Phoebe | 1 | 3 | 3 | 1 | 2 | 2 |
| 9 | Say’s Phoebe | 1 | |||||
| 9 | California Scrub-Jay | 1 | 1 | 1 | |||
| 9 | American Crow | 9 | 26 | 6 | 5 | 6 | 6 |
| 9 | Common Raven | 2 | 9 | 2 | 1 | ||
| 9 | Oak Titmouse | 1 | |||||
| 9 | Tree Swallow | 5 | 1 | ||||
| 9 | Violet-green Swallow | 5 | |||||
| 9 | No. Rough-winged Swallow | 17 | 20 | 7 | 1 | ||
| 9 | Barn Swallow | 10 | 20 | 18 | 22 | ||
| 9 | Cliff Swallow | 3 | 7 | 24 | 24 | ||
| 9 | Bushtit | 4 | 5 | 25 | 2 | 3 | 12 |
| 9 | Wrentit | 1 | 1 | 4 | 2 | 2 | 2 |
| 9 | Ruby-crowned Kinglet | 1 | 1 | ||||
| 9 | Blue-gray Gnatcatcher | 1 | |||||
| 9 | Bewick’s Wren | 1 | |||||
| 9 | Northern Mockingbird | 1 | 1 | ||||
| 9 | European Starling | 1 | 10 | 10 | 10 | 6 | |
| 9 | Western Bluebird | 1 | |||||
| 9 | House Finch | 8 | 9 | 26 | 15 | 5 | 4 |
| 9 | Lesser Goldfinch | 10 | 4 | 2 | 2 | ||
| 9 | Dark-eyed Junco | 1 | 1 | 1 | 2 | ||
| 9 | White-crowned Sparrow | 8 | 7 | 5 | 1 | ||
| 9 | Song Sparrow | 12 | 8 | 10 | 8 | 6 | 5 |
| 9 | California Towhee | 2 | 3 | 3 | 3 | 2 | 1 |
| 9 | Spotted Towhee | 1 | 1 | 2 | |||
| 9 | Hooded Oriole | 1 | 1 | 1 | |||
| 9 | Brown-headed Cowbird | 2 | |||||
| 9 | Great-tailed Grackle | 2 | 3 | 6 | 8 | ||
| 9 | Orange-crowned Warbler | 1 | 1 | 3 | 1 | 2 | |
| 9 | Common Yellowthroat | 2 | 2 | 6 | 4 | 5 | |
| 9 | Yellow-rumped Warbler | 6 | 8 | 3 | |||
| 9 | Wilson’s Warbler | 1 | |||||
| Totals Birds by Type | Jan | Feb | Mar | Apr | May | Jun | |
| 1 | Waterfowl | 196 | 78 | 91 | 50 | 55 | 54 |
| 2 | Water Birds – Other | 922 | 144 | 339 | 104 | 176 | 163 |
| 3 | Herons, Egrets & Ibis | 7 | 8 | 10 | 4 | 4 | 17 |
| 4 | Quail & Raptors | 0 | 5 | 3 | 4 | 3 | 1 |
| 5 | Shorebirds | 92 | 86 | 76 | 9 | 2 | 6 |
| 6 | Gulls & Terns | 685 | 183 | 52 | 26 | 161 | 106 |
| 7 | Doves | 6 | 5 | 1 | 3 | 8 | 6 |
| 8 | Other Non-Passerines | 1 | 14 | 10 | 10 | 5 | 3 |
| 9 | Passerines | 57 | 92 | 160 | 115 | 103 | 103 |
| Totals Birds | 1966 | 615 | 742 | 325 | 517 | 459 | |
| Total Species by Group | Jan | Feb | Mar | Apr | May | Jun | |
| 1 | Waterfowl | 8 | 8 | 8 | 5 | 4 | 5 |
| 2 | Water Birds – Other | 8 | 9 | 9 | 8 | 5 | 5 |
| 3 | Herons, Egrets & Ibis | 3 | 2 | 4 | 4 | 3 | 4 |
| 4 | Quail & Raptors | 0 | 4 | 3 | 3 | 3 | 1 |
| 5 | Shorebirds | 10 | 10 | 10 | 4 | 1 | 2 |
| 6 | Gulls & Terns | 5 | 7 | 8 | 4 | 4 | 5 |
| 7 | Doves | 1 | 1 | 1 | 2 | 2 | 2 |
| 8 | Other Non-Passerines | 1 | 5 | 3 | 3 | 3 | 2 |
| 9 | Passerines | 14 | 20 | 25 | 22 | 21 | 16 |
| Totals Species – 100 | 50 | 66 | 71 | 55 | 46 | 42 |
How to Photograph a Goshawk in Flight | Nat. Geographic
[Posted by Chuck Almdale, suggested by Lillian Johnson]
A behind the scenes look at how this bird of prey was photographed.
Article & photography by Charlie Hamilton James. 26 Jan 2018
I was going to title this “Avian Parkour” – you’ll see why – but went with the original title. The videos embedded in the article must be seen to be believed.
Slot Boxes at O’Melveny Park
[by Chuck Almdale]

I’ve always assumed that bird houses – typically built by humans for avian occupation – had round entrances. After all, bird bodies are fundamentally round in cross-section. At least, I assume they are although I haven’t sawed any crosswise to verify this assumption. And, in support of this assumption, every stinkin’ bird house I’ve ever seen in my entire life had a round hole for a door. Not one single triangular, square or rectangular door, except for the occasional cuckoo clock. So I’m not alone in my assumption. And additionally, birds go through those round doors much like a golf ball rolling down a tilted cylinder. Roundness everywhere.
So the first time I saw a bird house with a long horizontal slot, almost as long as the house was wide, for a door, at O’Melveny Park (Granada Hills, north San Fernando Valley a bit west of the #405), I and the fellow birder standing next to me wondered the same thing — “What’s that about?”

I’m still wondering that.
Birdhouses are typically designed for particular species or for a range of similar-sized cavity-nesting birds (e.g wren-sized, bluebird-sized, owl-sized, wood duck-sized), and the size of the hole is often very exactingly-sized to a 1/4th or 1/8th-inch, letting the target resident bird slip through but preventing larger predators or home-wreckers from getting in. I recall that decades ago I read that Western Bluebirds should get a slightly smaller hole than Eastern Bluebirds, a recommendation that has apparently been reversed as the North American Bluebird Society, to which all bluebirds with any social status belong, now recommends the same sized hole 1 1/2 inch to 1 9/16 inch in diameter for both species.
Or 1 1/8″ to 1 3/16″-high horizontal slot entrance. Yes, you read that right. A slot.
Well, I’m still mystified and wondering.
The most noticeable thing about the bird houses with slot doors at O’Melveny was that European Starlings, one of our most accomplished cavity home stealers and hole-pokers of someone else’s eggs, could shoot right through the slot-entrance without hardly slowing down. They only had to fold their wings a little. I wonder if they found themselves impaled into the rear wall on their very sharp-pointed bills, quivering from the impact like darts in a British pub.
Ok, I may be exaggerating a little there, but not that much. The main point is if the door is supposed to keep out predators and other unwanted guests, the slot wasn’t doing its job. Wasn’t anyone watching?
The Study
According to Cornell Lab of Ornithology, the folks that bring you eBird and Merlin, someone has been watching. No, not just hungry homeless starlings, but real living human researchers, aided by a small army of citizen scientists, or was that an army of small citizen scientists? No matter.

Over a period of four years and 280 Mountain Bluebird nests from 101 boxes, researchers from British Columbia tracked potential data every which way: male and female age, direction the nest box faced, distance to the nearest tree, distance to the nearest Mountain Bluebird and Tree Swallow nests, elevation, year, percentage of tree cover, mean temperature during the nestling period, total rainfall during the nestling period, feeding rate, and a few other potentially-interacting variables that might explain fledging success. The nest boxes did not have predator guards, and were similar in all aspects other than entrance hole style.
The Results Are In
- Bluebirds chose boxes in proportion to their availability (slot entrances were less common). There was no difference in selection based on age or body size. While selection does not always equal preference (birds may not be able to obtain their first choice), there was no strong evidence that bluebirds preferred either box type.
- Birds nesting in round-hole boxes produced significantly more eggs.
- Birds nesting in round-hole boxes had significantly better fledging success.
- Hatching success and first egg date were unaffected by box type.
- Complete nest failure was more common in slot boxes, potentially due to more exposure to the elements.
- For hole boxes, temperature and feeding rate affected fledging success. For slotted boxes, no one factor seemed to predict success.
The Conclusion
The authors recommend the use of nest boxes with round entrance holes over those with slotted entrances. Repeat: round.
Well…I could have told you that and would have had you asked, just as any Starling could tell you that but never would. But it’s always good to do the study, gather the data, and support (or amend) your intuition, aka your hypothesis in its null form.
So…O’Melveny park people, are you listening? Out with the slots, in with the holes. Unless, of course, your intention is to supply wonderful housing accommodations to European Starlings, and not to Western Bluebirds.
As we went to O’Melveny to check out all the birds, nesting or otherwise, here’s the eBird report for your perusal and delectation. We also had fun with the Merlin app on my companion’s phone, pointing out the songs and laughing at the mis-identifications. Canada Goose indeed!
O’Melveny Park, Los Angeles, California, US
Jun 14, 2025 8:20 AM – 10:50 AM
Protocol: Traveling2.0 mile(s)
Checklist Comments: Temps 68-72°F. No wind, sunny. Not a single warbler.
33 species (+1 other taxa)
California Quail 1 Heard only
Rock Pigeon (Feral Pigeon) 20
swift sp. 20 Too high for details; probably White-throated as they nest in nearby cliffs.
Black-chinned Hummingbird 1 Adult male
Anna’s Hummingbird 3
Allen’s Hummingbird 10
Cooper’s Hawk 1 On electric pole near entrance
Red-shouldered Hawk 1
Acorn Woodpecker 6
Nuttall’s Woodpecker 4
Western Flycatcher 2
Black Phoebe 4
Ash-throated Flycatcher 2
Cassin’s Kingbird 1
Western Kingbird 1
California Scrub-Jay 6
Common Raven 10
Oak Titmouse 1
Violet-green Swallow 6
Barn Swallow 8
Bushtit 4
Wrentit 2
White-breasted Nuthatch 2
Northern House Wren 8 Heard only
Bewick’s Wren 3 2 heard only
European Starling 8
California Thrasher 1 Heard only
Western Bluebird 6
House Finch 16
Lesser Goldfinch 5
Dark-eyed Junco 5 2 heard only
California Towhee 8
Spotted Towhee 3
Black-headed Grosbeak 4 2 heard only
View this checklist online at https://ebird.org/checklist/S250326450
One Avian Taxonomic List to Rule them All | AviList
[by Chuck Almdale]
It’s not as dire as the title implies, but reportedly the proponents of the four major avian taxonomic checklists in the world have been negotiating among themselves to reconcile the many differences between their lists, in order to arrive at One List, hereafter to be known as AviList.

I’m not shocked to learn this but at the same time I didn’t know people were closing in on accomplishing it. As diehard readers of this blog will easily recall, we posted a long piece about the Four Different Checklists of the Birds of the World back in March 2019. At that time the numbers looked like this:
Total recognized species:
- BirdLife Int’l/Handbook of Birds of the World – 11,126 species
- International Ornithological Congress (IOC) – 10,896 (230 fewer than BirdLife)
- Clements/eBird – 10,585 (541 fewer than Birdlife, 311 fewer than IOC)
- Howard & Moore – 10,175 (951 fewer than BirdLife, 721 fewer than IOC, 410 fewer than Clements)
Total species recognized by at least one of the four lists was 11,524, of which 86.5%% or 9,968 species were accepted by all, leaving 1,556 (13.5%) in dispute. The breakdown of that 1,556 was:
- 496 species, or 4.3% of the total, are recognized by three taxonomic authorities.
- 362 species, or 3.14%, are recognized by two authorities.
- 698 species, or 6.1%, are recognized by a single authority only.
Checklist agreement was as follows:
- BirdLife Int’l: 89.6% of species shared with all others; 5.6% shared with one or two other lists; 4.8% unique to itself.
- Clements: 94.2% of species shared with all others, 5.6% with 1-2 other lists, 0.21% unique to itself.
- IOC: 91.5% of species shared with all others, 7.4% with 1-2 other lists, 1.13% unique to itself.
- Howard & Moore: 98% of species shared with all others, 1.8% with 1-2 other lists, 0.2% unique to itself.
That’s where it stood six years ago, and that’s what the ornithological taxonomists had to deal with in order to reconcile that mess.
Word has it that as of June 11 2025, three of the lists (Howard & Moore the exception) have reconciled their differences. The AviList checklist v2025 (perhaps also version 15.1) lists:
| Species | 11,131 |
| Subspecies | 19,879 |
| Orders | 46 |
| Families | 252 |
| Genera | 2,376 |
The last time I checked eBird, last fall, they had 11,017 species, so now there’s another 114 species I’ll probably never see. Plus a new family. Which ones are they? Figure that out, write it up (including scientific name and breeding range would be very nice to include), send me the list and I’ll post it and give you the credit. Fame and fortune for you will no doubt swiftly ensue.
This article from the Birding Ecotours website was just sent to me. It’s worth reading to catch up on what’s up, including topics like “biological species concept” which is critically important to us all, especially those who wish to have viable offspring someday.
Birds of the World website doesn’t add much, but here it is.
Same thing for Birdlife International here.
After that, go to the AviList website and poke around. You can download, for free, Avilist v2025 in Extended (.xlsx) at 8.7 MB, and Short (.xlsx) at 5.1 MB, and then while away the hours seeing what’s what. I haven’t yet screwed up my courage to tackle that.
Then toss out all your old field guides, handbooks, bird photo books, checklists and lifelists and start over.
Just kidding. They’re mostly still useful. Just hope that the dingbats who want to cancel all eponymous bird names find something else to waste their time on and stop adding to our troubles and annoying everyone.
There. That takes care of your weekend.


