Ammonites' shells make the animals look most like nautiluses, but they are actually thought to be more closely related to coleoids. 'Some of their morphology was closer to that of the coleoid group,' ...

Little is known about how these ammonites lived, but it is thought they would have been slow swimmers due to the drag caused by their open shells. While this may look a bit like a snail, it's actually ...

Scientists believed that ammonites, like modern cephalopods, had soft body tissue with tentacles attached to their heads for catching prey. Fossil evidence indicates they had sharp, beaklike jaws ...