Life & Evolution

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sauropod tracks and cast

Tracks made by sauropods some 170 million years ago crisscross a swath of land in Scotland (left); a sediment cast of one track (right) stretched longer than 35 centimeters (lens cap is 5 centimeters wide).

red howler monkey

DEEP ROARS, SMALL SPERM STORES  In nine species of howler monkey, researchers found an inverse relationship between testes size and size of the hyoid bone, part of the vocal tract.

Fossil Finder screenshot

INTERNET SEARCH  To better understand the past environment of Kenya’s Lake Turkana Basin, asks volunteers to scrutinize thousands of aerial photos taken at the site.

Life & Evolution

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