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Evolution

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harbor porpoise

FERTILE FOLDS In harbor porpoises (one shown), females have vaginal folds (3-D endocast shown below) that may help them exert control over fertilization.

marsupial lion illustration

NEW MARSUPIAL LION  A newly named species of extinct marsupial lion (illustrated) was dog-sized but probably as fierce as anything in its forest. 

Halszkaraptor escuilliei

DINO SWIMMER  This birdlike dinosaur, Halszkaraptor escuilliei, probably spent a lot of time in the water. It had flipperlike forelimbs, a long neck for snatching aquatic food, and its upright posture resembles that of short-tailed birds such as ducks.

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