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Usurpation and Brooding of Least Tern (Sternula antillarum) Chicks by Common Terns (Sterna hirundo)
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Usurpation and Brooding of Least Tern (Sternula antillarum) Chicks by Common Terns (Sterna hirundo)
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Journal Article
Usurpation and Brooding of Least Tern (Sternula antillarum) Chicks by Common Terns (Sterna hirundo)
2024
Overview
While nest usurpation and subsequent incubation of eggs and even brooding of chicks from other species has been reported for Common Terns (Sterna hirundo), such behavior is considered rare. We report an observation of a Common Tern pair usurping the Least Tern (Sternula antillarum) nest and brooding the Least Tern chicks. While the Least Tern pair attempted to provide care for the chicks, the Common Terns displayed aggressive behavior and defended the nest. Though both species attempted to feed the chicks, no feeding events were observed due to harassment from the other species. Neither pair was observed nesting prior to or following this event, and all chicks are believed to have been lost to predation. We discuss the possible scenarios leading to the observed usurpation event, the possibility that usurpations are more common than previously believed, and the need for different monitoring methods to elucidate the causes of usurpations.
