Prehistoric Animal Museum

Meet today’s friendSauropod dinosaur

Apatosaurus

Look at its long neck, long tail and four sturdy, pillar-like legs.

This is Apatosaurus, a giant plant-eating dinosaur from the Late Jurassic. Look at its long neck, long tail and four sturdy, pillar-like legs.

Still model of Apatosaurus on a transparent background

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Preparing the Apatosaurus exhibit.

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Guide for grown-ups

When it lived: Late Jurassic (about 152–145 million years ago)
Where fossils were found: western United States, North America
Body length: 21–24 m (about 69–79 ft)
Diet: Plant-eater
What kind of animal?: Sauropod dinosaur. Apatosaurus was a sauropod on the diplodocoid branch of the dinosaur family tree. Four pillar-like legs supported its huge body, while its long neck and tail made a striking outline. Length estimates vary between species and individual fossils.

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Narration transcript

This is Apatosaurus, a giant plant-eating dinosaur from the Late Jurassic. Look at its long neck, long tail and four sturdy, pillar-like legs.

Research notes about Apatosaurus

Research summary

Classification used here: Sauropod dinosaur. Fossils assigned to Apatosaurus are known from Late Jurassic (about 152–145 million years ago) and have been found in western United States, North America. The museum uses 21–24 m (about 69–79 ft) as the reference body length and describes the diet as plant-eater. Apatosaurus was a sauropod on the diplodocoid branch of the dinosaur family tree. Four pillar-like legs supported its huge body, while its long neck and tail made a striking outline. Length estimates vary between species and individual fossils.

Fossil evidence and reconstruction limits

The 21–24 metre range combines genus-level educational sources with estimates from different reconstructions; it does not identify this model with one specimen.
Apatosaurus and Brontosaurus are presented as closely related but separate genera, in line with their usual modern treatment.
The purpose of the tail and any group-living behaviour are not presented as settled facts.

Scientific sources

Apatosaurus - Natural History MuseumAccessed 2026-07-27
Thoroughly Modern Apatosaurus - American Museum of Natural HistoryAccessed 2026-07-27
The Morrison Formation - U.S. National Park ServiceAccessed 2026-07-27

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.

3D model and asset credits

Apatosaurus: “Apatosaurus” by toro ardido modelos 3d, CC BY 4.0; modified for the Prehistoric Animal Museum. Creative Commons Attribution 4.0 International

Open source and licensing

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.

View the GitHub project Read the full licensing notes

Official source

Made by Leon Made This

Prehistoric Animal Museum is made and maintained by Leon Made This. Use these addresses to verify the official project and its creator.

Official Prehistoric Animal Museumhttps://leon-made-this.work/museum/en/Leon's personal websitehttps://leon-made-this.work/

More information is available below.

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Leon Made This

About this museum

A little museum made by a developer dad for his daughter

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

Made by Leon Made This

Prehistoric Animal Museum is made and maintained by Leon Made This. Use these addresses to verify the official project and its creator.

Official Prehistoric Animal Museumhttps://leon-made-this.work/museum/en/Leon's personal websitehttps://leon-made-this.work/

View the source on GitHub Read the licence and asset notes