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Evolution

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howler monkey

MONKEY BUSINESS  Being able to tell red and green apart helps howler monkeys like this one pick out younger, more nutritious leaves, research suggests.  

Dinocephalosaurus

PREHISTORIC PREGNANCY  With a long-necked body not suited to walking, an ancient marine reptile Dinocephalosaurus (illustrated) may have evolved to give live birth in the ocean rather than lay eggs on land, a new study suggests.

horse evolution

HORSE RACE  As ancient horses rapidly diversified into new species, drastic changes in body size didn’t occur, despite the diversity found in the fossil record, a new analysis shows. (Three species from roughly 8 million years ago are shown.)

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