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Weaver birds are famed for their elaborate nests—teardrop-shaped structures that dangle from telephone poles and treetops, with long entrance tubes that make it impossible for snakes to slink in and nab a baby bird. And it’s hard to imagine a more complex structure—a weaver’s creation can take hundreds of hours and thousands of grass strands to make. But why would these birds go to all that trouble? Some scientists think that the nests are meant to protect chicks from predators, particularly snakes. Others argue that they help chicks find food by allowing them to “s
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