Abstract
We observed adult Kelp Gulls (Larus dominicanus) capture and eat Olrog's Gull (L. atlanticus) chicks in the Bahía Blanca estuary, Argentina. This estuary holds the largest breeding colony of Olrog's Gulls. There are no previously published reports of Kelp Gulls capturing and eating Olrog's Gull chicks. Our data support suggestions made by other authors about the possible existence of conflicts in colonies where both species breed in close proximity.
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