About a dozen genera of early whales have been lumped together in a group called the Archaeocetes, because no one knows enough about them to classify them further. (newscientist.com)
Suction feeding likely enabled early whales to move from a tooth - based feeding style to filter - feeding, by allowing them to capture smaller prey items than teeth alone could handle,» Dr Marx says. (sciencedaily.com)
The adaptations resemble those of early whales and today's hippopotamus, and make Spinosaurus the only dinosaur known to swim, the researchers say. (sciencemag.org)