Chris Nickels for NPR

How Sound Shaped The Evolution Of Your Brain

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Lily chases sheep for the first time in her shepherd-mix life, at Raspberry Ridge Sheep Farm in eastern Pennsylvania. Several times a year the farm invites dogs for "herding instinct tests." Fred Mogul/WNYC hide caption

toggle caption Fred Mogul/WNYC

Do City Dogs Dream Of Chasing Country Sheep?

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Male and female tungara frogs. Among these frogs, the guy with the best call usually wins the gal — except when you throw a third-choice loser into the mix. Alexander T. Baugh/Encyclopedia of Life hide caption

toggle caption Alexander T. Baugh/Encyclopedia of Life

Froggy Went A-Courtin', But Lady Frogs Chose Second-Best Guy Instead

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Daniel Horowitz for NPR

Contagious Aphrodisiac? Virus Makes Crickets Have More Sex

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