Beaks show why 'sister' species don't live together

(Phys.org)—A study of closely-related bird species has found that they do not coexist in the same region because they remain too ecologically similar and will out-compete each other, not because of geographical barriers ...

Grassland sparrows constantly searching for a nicer home

Some birds regularly move to new territories between years, depending on factors including habitat quality and the presence of predators, but what about within a single breeding season? Grassland ecosystems are particularly ...

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