Moeritherium was a semi-aquatic mammal, distantly related to modern elephants.
Moeritherium lived in the Eocene Epoch. Most of it's time was spent in the rivers and mangroves in warm, coastal areas. It's sheer size protected them from sharks and crocodiles.
Description[]
They were herbivores, so, they fed mainly on aquatic plants, grazing on the riverbeds and surfacing for air, using it's short trunk (proboscis) like a snorkel perhaps. The trunk, being the main clue as to this peculiar animal's relation to modern Proboscideans.
Several Moeritherium appeared in the second episode of Walking with Beasts. A female Basilosaurus went to the mangroves in a desperate search for food, and she almost killed a Moeritherium, trapping it on a sand bar (increasingly submerging as the tide rose) The Moeritherium swam to safety, escaping the scene when the female Basilosaurus attacked too soon out of hunger, getting herself temporarily stuck on part of the submerged sand bar.