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Life & Evolution

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Zebra finches

FINCH IN A PINCH  Zebra finches with no water can dodge dehydration by metabolizing body fat, a new study shows. 


EARLY START  The wavelike mounds of sediment called stromatolites (marked by dashed lines) embedded inside this cross section of a 3.7-billion-year-old rock may be the oldest known fossilized evidence of life on Earth.


The rattlesnake rattle evolved only once. A new study contends that it may have evolved out of a simple behavior, tail vibration, that is common among many snake species.

Life & Evolution

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