Mosasaurus
Look at its flippers and powerful tail. Can you imagine its tail pushing it forwards while the flippers steer?
Preparing the Mosasaurus exhibit.

Look at its flippers and powerful tail. Can you imagine its tail pushing it forwards while the flippers steer?

Preparing the Mosasaurus exhibit.
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Explore together
This is Mosasaurus, a huge sea reptile that lived during the Late Cretaceous. It was not a dinosaur. Look at its flippers and powerful tail. Can you imagine its tail pushing it forwards while the flippers steer?
Fossils of Mosasaurus date to the Late Cretaceous (about 82 million to 66 million years ago) and have been found in Europe, North America, Other Late Cretaceous seas.
Leon Made This compiled these research notes from public museum resources and scientific papers while preserving uncertainty in the reconstruction. Last reviewed 2026-08-07.
The code is licensed under AGPL-3.0. Original science writing and project artwork use CC BY-NC-SA 4.0 for non-commercial sharing. The brand policy prevents impersonation, and third-party assets keep their original licences.
Official source
Prehistoric Animal Museum is made and maintained by Leon Made This. Use these addresses to verify the official project and its creator.
More information is available below.
Leon Made This
I’m Leon, a developer and a dad. When my daughter was three, dinosaur chases on television frightened her, so I made a 3D prehistoric animal museum where she could look quietly and listen only when she wanted to.
The museum is free, with no sign-up, adverts or visitor tracking. Finding one interesting detail at a time is plenty.
Official source
Prehistoric Animal Museum is made and maintained by Leon Made This. Use these addresses to verify the official project and its creator.