Great Black-backed Gull, North Atlantic Predator

Great Black-backed Gulls have a reputation as serious predators of other birds. During the nesting season, they’ll prey on eggs and nestlings of other seabirds. They’ll also hunt adult seabirds including puffins and grebes, as well as songbirds as big as a grackle.

More info and transcript at BirdNote.org. 

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