Life & Evolution

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dinosaur illustration

BRIDGE THE GAP  Land crossings may have allowed dinosaurs (such as Supersaurus, shown in this artist’s illustration), lizards and early mammals to migrate across the Atlantic Ocean around 150 million years ago, one researcher proposes.

wolf lichen

WHAT’S IN YOUR LICHEN?  A wolf lichen (Letharia vulpina) is one of the species making scientists rethink more than a century of assumptions about what’s in a lichen.

person holding snail

Amphibious and aquatic snails like this one are a weak link in the life cycle of parasites that cause snail fever. 

Life & Evolution

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