Acorn Woodpeckers live in family groups of up to 15 individuals. Over time, if enough birds die off, an opportunity arises for unrelated birds to join the group and obtain a mate. Then, battles known as “power struggles” begin. Birds from other family groups form coalitions, with up to 30 birds in the skirmishes. Winners take all: mates, breeding territory, and thousands of acorns.

More info and transcript at BirdNote.org. 

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