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A Bilateral Gynandromorph Bobolink | Smithsonian Magazine

September 4, 2026
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[Posted by Chuck Almdale, submitted by Lillian Almdale]

Oftimes things do go awry. If there weren’t accidents and mutations in DNA, could evolution even take place?

An ‘Extremely Rare’ Half-Male, Half-Female Bird Temporarily Took Up Residence Outside of Chicago

The unusual-looking bobolink is what’s called a bilateral gynandromorph. The bird behaved like a male, eventually wooing a mate and raising fledglings.
By Sarah Kuta, daily Correspondent | Smithsonian Magazine | 21 August, 2026

The bobolink behaved like other males, singing, flying and establishing a breeding territory in hopes of wooing a female mate. Photo: Luke Dahlberg


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