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How did bird babysitting co-ops evolve?

Tags: evolution

The common understanding of Evolution is that it is a battle for survival: one must either "scrunch or be scrunched," as Nicodemus Boffin, the Dickens' character, famously says. Siberian jays are not cooperative breeders but they have taken what new research suggests is the first step toward  cooperation: living in family groups. The addition of this intermediate step may resolve a long-running battle  over the evolution of...

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How did bird babysitting co-ops evolve?

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