Female Finches Get Stressed Just Hearing the Voice of a Stressed-Out Mate

Humans aren’t the only animals who know when something’s the matter. The chirps of a stressed-out zebra finch may make his mate feel stressed too—even when she can’t see him. It’s a hint that a kind of empathy exists in birds.

Zebra finches (Taeniopygia guttata) mate for life. They work together to find food, guard their nests, and raise their young. When they’re apart, they call to each other to check in.

Emilie Perez, a researcher at the University of Saint-Etienne in France, and her

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