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1 December 2000 Female Blackcap Adoption of a Yellowhammer Clutch
Miroslav Čapek, Marcel Honza, Vojtěch Mrlík
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Four eggs in a Yellowhammer (Emberiza citrinella) nest were incubated for one day by a female Yellowhammer but subsequently abandoned. The day following abandonment, the nest and the clutch were adopted by a female Blackcap (Sylvia atricapilla) who incubated the eggs until a single Yellowhammer nestling hatched; two eggs were depredated, and the embryo in the third egg was dead but well-developed. The young Yellowhammer was fed for 6 days until it was taken by a predator. Because there were no obvious benefits for the adopting female Blackcap, we speculate that the adoption resulted from misdirected parental behavior.

Miroslav Čapek, Marcel Honza, and Vojtěch Mrlík "Female Blackcap Adoption of a Yellowhammer Clutch," The Wilson Bulletin 112(4), 542-543, (1 December 2000).[0542:FBAOAY]2.0.CO;2
Received: 7 April 2000; Accepted: 1 June 2000; Published: 1 December 2000
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