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What’s a vampire’s favorite fruit?
Interesting Fact: In winter, Yellow-rumped Warblers join flocks and switch to eating berries from fruiting shrubs. Sometimes the flocks are enormous groups consisting entirely of Yellow-rumped Warblers. If another bird gets too close, Yellow-rumped Warblers indicate the infraction by holding the body horizontally, fanning the tail, and raising it to form a right angle with its body. ( https://www.allaboutbirds.org/guide/Yellow-rumped_Warbler/lifehistory )