Female Birds' Nest Defense Instincts

This is a news story, published by ScienceBlog.com, that relates primarily to Duke University news.

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Nest-Desperate Birds Battle Hardest for Homes

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Birds that depend on ready-made tree cavities for nesting are far more likely to fiercely attack intruders than their relatives who can build nests almost anywhere.

Researchers from Duke University compared closely related species pairs across five bird families: swallows, wood warblers, sparrows, thrushes, and wrens.

Surprisingly, the researchers found that this aggression wasn’t linked to testosterone levels.

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