Its morphology shows well-developed fins and a large

but rather gliding from trees or elevated structures

Archelon was a marine species that was distributed in what is now North America

Altura 127  mm

Protocetus atavus Dorudon Its morphology shows well-developed finsProtocetus atavus is a species of primitive cetacean that belongs to the family Protocetidae, an ancestral branch of cetaceans that represents a transition between land mammals and modern cetaceans. This species lived during the Eocene, approximately 45 million years ago. Its name, Protocetus, reflects its position as an early ancestor of cetaceans. Physically, Protocetus atavus shared both terrestrial and aquatic characteristics. Although it already