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Evolution

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eggs

EGG DIVERSITY  Bird eggs vary greatly in shape, size and color. In a new analysis, researchers look for links between egg shape and birds’ traits and lifestyles.

illustration of Chinlestegophis

BACKSTORY WITH LEGS  Small and possibly living underground, the newly named extinct Chinlestegophis (artist’s illustration shown) still had legs but might be an ancient near-relative of today’s legless caecilian amphibians.

moon snail

KILLER DRILLERS  Predators such as moon snails (Naticarius orientalis shown) that kill by drilling through other animals’ shells offer a rare chance to test an idea about the power of enemies.

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