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Evolution

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Matabele ant

ANT RX A Matabele ant from Africa uses her mouthparts to treat a nest mate’s wounded leg in a prompt and effective insect version of health care.

fossil footprints

IMPRINTS  Scientists think that these fossilized footprints may represent the earliest evidence of a lizard running on two legs. Here, a front print (left) and a back print (right) are shown.

hummingbird

WHAT TO WATCH  The fast turns of hummingbirds have inspired a massive motion-tracking study of the birds’ flight maneuvers.

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