Dorudon

Dorudon was a prehistoric whale from the late Eocene epoch. It was a close relative to their larger but similar Basilosaurus.

Facts
Though it was smaller than Basilosaurus, it was very similar to it overall, and just like Basilosaurus it was essentially an older, less advanced version of the modern whales that died out during the Eocene-Oligocene extinction.

Dorudon also lived in pods. Whenever Dorudon gathered in numbers, it meant the females were about to give birth. These whales used their numbers to ward off predators.

Both in Walking with Beasts and Sea Monsters, Dorudon was contrasted with Basilosaurus as a social animal (like the modern dolphins and porpoises), while Basilosaurus was solitary (like some of the modern baleen whales and cachalot whale bulls).

Whale Killer
A pod of Dorudon were seen during their annual gathering to give birth. They were interupted by a mother Basilosaurus but were able to temporarily ward her off. Whilst the Basilosaurus scrubbed, the Dorudon gave birth. Then, the mother Basilosaurus reappeared and attacked the Dorudon. Several Dorudon calves were killed in the process.

The Fourth Most Deadliest Sea
A few Dorudon were briefly seen swimming past Nigel Marven.