File:All Todays Dolphin.png

A possible restoration of a dolphin, known from few bones, so they probably had strong back legs like other mammals, suggesting a land animal. A, as a strong digger related to an also-extinct moles of the Holocene, but we're much bigger, about the size of a large alligator, so these creatures were likely much stronger diggers than any known animal in history. B, however, some argued that dolphins were semi-aquatic due to the shape of their hand bones and the way their nostrils were placed onto the top of their heads, so dolphins could have come onto land only to rest or to either lay eggs or give birth. However, as C shows, in recent times, dolphins are suggested to be fully aquatic, not even coming onto land to rest or breed, instead they could have likely have live birth underwater, also due to their features, these reptilian-looking species would have resembled a Mesozoic Pliosaur or a Dolichorhynchops.