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Elegant Terns at Malibu Lagoon

June 13, 2015
Elegant Terns (Jim Kenney 4/29/15)

Elegant Terns (Jim Kenney 4/29/15)

“Elegant Terns are…well, they’re just so elegant!,” founding chapter member Abigail King used to say. They certainly are.

Elegant Terns (Jim Kenney 4/29/15)

More Elegant Terns (J. Kenney 4/29/15)

We were recently treated to the sight of thousands of Elegant Terns dropping into Malibu Lagoon, and on April 29 Jim Kenney caught them in action. Often starting off slow, such gatherings can build over several hours, until suddenly you realize you’re in the storm-center of a swirling mass of wings, bills and cries.

Elegant Terns (Jim Kenney 4/29/15)

Even more Elegant Terns (J. Kenney 4/29/15)

Some of us have been looking at Elegant Tern – and its disconcertingly similar conspecific Royal Tern – for decades, and we still have trouble telling them apart. Here are some tips.

Elegant Terns (Jim Kenney 4/29/15)

Some of the Elegants get spooked (J. Kenney 4/29/15)

Bill shape and size is one of the best field marks.
Elegant: Very long and slender. Lower bill lacks any gonydeal angle (bump on lower bill, common among gulls and terns); bottom of lower bill curves slightly downward to tip.

Elegant Tern pair (J. Kenney 4/3/10)

Elegant Terns: bill long & decurved, yellow-orange, black legs and cap, pink breast on right bird (J. Kenney 4/3/10)

Royal: Lower bill has small gonydeal angle near middle; bottom of bill appears either straight or curving slightly upward to tip. Bill is stouter than on Elegant.

Royal Terns (J. Kenney 11/15/06)

Royal Terns: stout orange bill, small gonydeal angle on lower bill, non-breeding dark cap barely reaches dark eye (J. Kenney 11/15/06)

The juveniles of  both species will have shorter bills for a while. Species with large bills take longer to develop a full-sized bill.

Caspian (rear) & Royal (front) Terns (J. Kenney 4/14/10)

Size ranges of Caspian (rear) & Royal (front) Terns overlap (J. Kenney 4/14/10)

Bill color in both species range from pale yellow to bright orange, almost red. Juveniles have the palest bills; adults tend towards darker orange and near-red; colors are brighter during breeding. Royal tends towards orange, Elegant tends towards yellow, but colors vary and overlap so greatly, it is more misleading than useful.

Elegant Terns (Jim Kenney 4/29/15)

Elegant Terns have a variety of bill colors (J. Kenney 4/29/15)

Black Cap: In non-breeding birds, this is the best field mark. In breeding season both have black caps from bill to shaggy nape; the Elegant has a slightly shaggier nape-crest. After breeding, black caps are gradually and partially lost, beginning at the bill. The Royal loses a bit more of the black cap than does the Elegant, and in winter, the black eye of the Royal stands out noticeably from the black crest, whereas the black eye of the Elegant remains ‘buried’ within, or at the very edge, of the black cap.

Elegant Tern non-breeding (Joyce Waterman)

Elegant Tern with non-breeding cap, note black plumage in front of eye. Note decurved lower bill and pale yellow to deep orange bill.
(Joyce Waterman 6/14/14)

Elegant Tern with non-breeding cap (J. Waterman (9/22/13)

Elegant Tern with non-breeding cap; note orange legs (J. Waterman (9/22/13)

Calls are similar: The Elegant perpetually utters a “kreeeeek!” screech, and when the flock is large, it can be extremely noisy. Royals have a lower “koorrick” call, but at the lagoon seem to remain quiet. Maybe they can’t get a word in edgewise when Elegants are around.

Royal tern (left) with non-breeding crest, 3 Elegant with breeding crest. Royal is noticeably bulkier. Elegant with neck fully extended looks as tall as Royal. (J. Kenney)

Noticeably bulkier Royal Tern (left) before developing breeding crest which Elegant already has. Elegant with fully extended neck seems as tall as Royal.
(J. Kenney Apr’07 Playa del Rey, CA)

Dimensions: Elegant and Royal almost, but not quite, overlap. Royal and Caspian (world’s largest tern) overlap in size, not in weight. Royal and Caspian Terns overlap in all dimensions with Ring-billed Gull.[1]

Species Length (in) Wingspan (in) Weight (oz)
Least Tern 8.7 – 9.5 18.9 – 20.9 1.4 – 1.8
Black Tern 9.1 – 11 22.4 – 25.6 2.1 – 2.6
Common Tern 12.6 – 15.4 28.3 – 32.7 3.4 – 5.1
Forster’s Tern 13 – 14.2 28.7 – 32.3 4.8 – 6.8
Elegant Tern 15.4 – 16.9 29.9 – 31.9 7.6 – 10.6
Royal Tern 17.7 – 20.1 39.8 – 53.1 11.3 – 17.6
Caspian Tern 18.9 – 22 50 – 55.1 20.2 – 27.6
For Comparison
Ring-billed Gull[2] 16.9 – 21.3 47.6 – 50 14.1 – 20.8

 

Legs and feet: About 90% of adult Elegant have black legs & feet; 10% have orange legs & feet. Adult Royal have black legs & feet. Juveniles of both species often have yellow-to-orange legs & feet.

Royal Tern juvenile and adult (J. Kenney 8/4/09)

Royal Tern juvenile has spotty back & yellow-orange legs. The bill may also be shorter. (J. Kenney 8/4/09)

Breast: White, but breeding Elegant often has a pale pinkish cast. This comes from carotenoids (as in carrot) – specifically astaxanthin from fish and crustaceans in their diet, is in the feathers themselves, and does not occur on the plumage surface or in preen oil, as some have previously speculated. Carotenoids color the plumage of many other birds, including Flamingos and House Finches. (See above photo of Elegant Tern bill shape.)

Elegant Terns (Jim Kenney 4/29/15)

Anxiety spreads (J. Kenney 4/29/15)

Wings are long, slender and pale underneath with limited dark in the primaries; tails are noticeably forked.

Elegant Terns (Jim Kenney 4/29/15)

Waves of flight (J. Kenney 4/29/15)

Still confused? Join the club. Confusion is the proper attitude. The best way to differentiate them is to get them to stand side-by-side. Then – usually! – the differences in bulk, crest, size, bill shape and length, and eye location in the black cap become obvious. Sort of.

All terns are plunge divers, feeding on small fish. Most gulls will eat nearly anything, plucking their food from the surface of the water or ground, robbing other birds (especially terns) or hanging around pelicans, hoping for a freebie.

Royal Terns are not globally threatened. They nest along both coasts of North & South America, the Caribbean, and the west coast of Africa, totaling over 70,000 pairs. Our west coast populations have suffered crashes in the past 40 years due to the virtual disappearance of their staple food, the pacific sardine. The relatively large size of their prey also makes them especially susceptible to pesticides working their way up the food chain.

Elegant Terns (Jim Kenney 4/29/15)

They’re very noisy (J. Kenney 4/29/15)

Elegant Terns are considered near-threatened, numbering 30,000-50,000 pairs, about 90% of which nest on Isla Rasa, 1/3rd way down the sea of Cortez. [See map.] Such concentration on a particular breeding location makes them highly susceptible to local dangers, and gathering of eggs by local fishermen, before the island was declared a sanctuary in 1964, nearly wiped them out. Isla Rasa is also the primary breeding location of Heermann’s Gull, commonly seen at Malibu Lagoon.

Elegant and Royal Terns are not always at the lagoon. Our records show:

Royal Tern Elegant Tern
Month Times Present Total Birds
Times Present Total Birds
Jan 11 105 0 0
Feb 11 92 1 1
Mar 7 45 12 386
Apr 11 45 13 4785
May 11 53 13 430
Jun 9 40 10 460
Jul 6 25 9 1154
Aug 10 44 14 351
Sep 9 50 15 260
Oct 9 26 13 79
Nov 6 11 8 16
Dec 7 61 0 0
Totals 107 597 108 7922
Average 48.9% 5.6 49.3% 73.4
Notes. (1) (2) (1) (3)
1. Presence percentage of 219 census dates
2. Average present on 107 visits
3. Average present on 108 visits

The single Elegant Tern present in Feb. 2010 was an anomaly. Normally they are completely absent from SoCal December through February. As the above table shows, while both species are present nearly equally often, Elegant, absent in winter, still outnumbers Royal 13-to-1.

Elegant Terns (Jim Kenney 4/29/15)

Chaos reigns (J. Kenney 4/29/15)

Birders visiting from the East Coast and around the world often have Elegant Tern high on their ‘want list.’ Although it ranges from southern Washington State to Peru, SoCal is probably the most easily accessible place in the world to find it. Something to think about the next time you see this truly elegant bird on the sand.     [Chuck Almdale]

Notes:
[1] Handbook of Birds of the World (HBW), Vol. 3; Lynx Edicions, 1996; del Hoyo, Elliot & Sargatal
[2] There is wide disagreement on Ring-billed Gull length. Sibley’s & NGS field guides both give 17.5″; HBW 18.1-21.3″, Cornell Lab of Ornithology 16.9-21.3″, BeautyOfBirds.com gave averages of female 18.5″ male 20″, other web sources gave 16″, 17″, 18″, or 19″. I chose to use the Cornell lab length dimension as most inclusive.

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5 Comments
  1. ethanski permalink
    January 6, 2016 4:18 am

    Copy of my comments. Eg
    Ciao. Be well, do good, walk as fast as you can, & hope for a better world! Have a marvelous, green day too.

    Begin forwarded message:
    From: “Ethan Greenspan, ohb.”
    Date: January 5, 2016 8:48:26 PM PST
    To: Katherine Pease; Cc: Don Sterba , Eric & Ann Brooks, Walter Lamb, “Larry W. Allen”, Kimball Garrett, Los Angeles Audubon Society, Los Angeles Audubon, “Ethan Greenspan, ohb.”
    Subject: Re: Malibu Lagoon – Oops, this part didn’t get sent:
    Dear Ethan; Thank you for the email and concern about the Malibu Lagoon. It does take some time for plants to establish after a major restoration but so far, all the monitoring reports have shown positive results in terms of water circulation and overall health of the wetlands. You can read the most recent report showing scientific monitoring results for 2 years post-restoration here:
    http://www.santamonicabay.org/wp-content/uploads/2015/06/Malibu-Lagoon_Comprehensive-Monitoring-Report_Yr2_FINAL_web.pdf
    The report shows that circulation, and thus dissolved oxygen, have increased since the restoration. Fish and other aquatic animals require specific levels of oxygen in the water to be able to live there. The report also shows that the condition of the wetlands has improved as measured through the California Rapid Assessment Method (CRAM). And finally, wildlife, such as fish and benthic invertebrates, have returned and increased in diversity since the restoration.
    I hope this allays some of your concerns.
    Take care, Katherine

    Like

  2. carolejim permalink
    June 14, 2015 11:09 am

    Chuck: This is the most comprehensive discussion of Elegant Terns ever! I am pleased to have been a part of it. With thanks……..Jim

    Like

    • Chukar permalink*
      June 16, 2015 9:05 pm

      Many thanks to you, Jim. Without your photos there would have been no article.

      Like

  3. Robert Gurfield permalink
    June 13, 2015 9:54 pm

    Good post. Thank you. Bob

    Like

  4. ethanski permalink
    June 13, 2015 8:37 pm

    Wow, great article. Am passing it on others. gracias.ethan g.  Cheerio!!
    *** BTW, no trees or puppies were harmed in the sending of this e-message; but some electrons probably were disturbed!

    Like

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