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Mosasaurs were the real leviathans of the Mesozoic Era, gigantic marine lizards that grew as large as whales. Some were wide-ranging hunters of large prey while others snacked on shellfish at the bottom of shallow seas. They became the biggest predators of the Cretaceous oceans in just 25 million years, a short period in geologic time.

A genetic analysis of two species of tardigrade, or water bear, has given great insight into the genetic mechanisms that help them survive extreme conditions. Although tardigrades look similar to arthropods like insects and spiders, their genes show a much closer relationship to round worms.

Baleen whales underwent a number of evolutionary transitions on the journey from small hunters to giant filter-feeders. Recent research shows that there were a large number of experimental methods of feeding, including the origin of filter feeding long before the origin of baleen.