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There are three major types of diets that animals have. Animals that eat meat and other animals are called carnivores. But animals that only eat plants and vegetables are called herbivores. An animal that will eat plants, and meat are called omnivores. There are many other minor food diets such as insectivores. Archelon is a omnivore. It ate squid, jellyfish, and other sea animals. It is unknown how much they ate, but they were large animals and would have needed to eat a lot. They found their food by swimming out and hiding near the surface of the ocean. If he found something good he would hunt after it. Its beak was very powerful so it could break the shells of other animals. Archelon could pretty much anything. Resources I used for this post are: http://www.uhaul.com/supergraphics/states/south_dakota/turtle/interview.html http://www.kidsdinos.com/dinosaurs-for-children.php?dinosaur=Archelon http://students.cis.uab.edu/cassieh/ProjectArchelonPart.html
All the above are great resources if you have any questions!