Nesting in cavities protects birds from predators—to a point

Nesting in cavities provides birds with some protection from predators—but it isn't foolproof. A new study from The Auk: Ornithological Advances explores how Poland's cavity-nesting Marsh Tits deal with predator attacks and finds that while tactics such as small entrances and solid walls do help, adaptations like this can only take the birds so far.

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