Stickleback Cousins (IMAGE)

University of Texas at Austin

Stickleback Cousins

Caption

Two male sticklebacks of the same age -- one from a stream (top) and one from a lake (bottom) -- are each highly adapted to their own local environment. According to Bolnick, apart from a dramatic difference in size, the fish also differ in immune traits, body shape, armor to defend against predators, and "basically anything we can think to measure."

Credit

Daniel Bolnick/U. of Texas at Austin

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