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Apatosaurus
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An illustration of an Apatosaurus, a massive long-necked dinosaur with a long whiplash tail, shown beside a car and two people for scale. Measurement bars indicate 1 meter and 3 feet, emphasizing the dinosaur's enormous size. Illustration showing the body shapes of five extinct reptiles: the long-necked Elasmosaurus, the streamlined marine Kronosaurus, the small Placodus, the large long-tailed Apatosaurus, and the spiked Stegosaurus.
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Apatosaurus summary
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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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Apatosaurus: References & Edit History

Article Contributors

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  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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Article History

Type Description Contributor Date
Article revised and updated. Nov 06, 2026
Add new Web site: University of California - eScholarship - Was Apatosaurus a Vegan? Dinosaur Knowledge Rocks When Learning About Evolution (PDF). Mar 11, 2025
Add new Web site: Animal Corner - Apatosaurus. Mar 15, 2024
Add new Web site: National Geographic Kids - Apatosaurus. Apr 26, 2022
Add new Web site: Live Science - Facts About the 'Deceptive Lizard'. Apr 26, 2022
Add new Web site: Extinct Animals - Apatosaurus. Feb 21, 2021
Article revised and updated. Aug 27, 2020
Add new Web site: Kids Dinosaurs - Apatosaurus. Oct 11, 2017
Length and weight of Apatosaurus and Brachiosaurus updated.. Nov 06, 2015
Material about history of similarities and differences between Apatosaurus and Brontosaurus added. Apr 07, 2015
Add new Web site: Animal Planet - Apatosaurus. Oct 16, 2013
Add new Web site: Buzzle.com - Brontosaurus Dinosaur. Oct 11, 2013
Add new Web site: Enchanted Learning - Apatosaurus. Oct 11, 2013
Add new Web site: Animal Planet - Apatosaurus. Oct 11, 2013
Add new Web site: Prehistoric-Wildlife.com - Apatosaurus. Apr 29, 2013
Add new Web site: Prehistoric-Wildlife.com - Apatosaurus. Apr 29, 2013
Add new Web site: Science Kids - Fun Science and Technology for Kids! - Apatosaurus. Mar 16, 2012
Added new Web site: Enchanted Learning - Apatosaurus. Mar 17, 2008
Article revised. Sep 27, 2002
Article added to new online database. May 27, 1999
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