Assertion: martin's egg | /r/HasProperty | black-billed magpies
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Source sentences:
text: Eggs, nestlings, and adults in the nest fall victim to black rat snakes, American crows, American kestrels, common grackles, northern flickers, chipmunks, deermice, domestic cats, weasels, American black bears, and raccoons, While flying or perched, predators to the tree swallow include American kestrels, black-billed magpies, barred owls, great horned owls, merlins, peregrine falcons, and sharp-shinned hawks.