When we think of the fish that inhabit the deep blue sea today, it’s easy to forget that they haven’t always been there. The ...

The origin of four-limbed animals known as tetrapods was thought to be fairly straightforward: Fish flopped onto land in the Devonian, evolved, and eventually diversified into the reptiles, birds, ...

IOWA CITY — Some 375 million years ago, Iowa was under water. The temperatures were hot, and brightly colored corals and huge fish moved through the shallow sea. Visitors can see a glimpse of this ...