The most Iconic sea creatures of the Jurassic period were unquestionably the plesiosaurs with their giant sizes, tiny heads and long slender necks. Their story dates back to the previous period, the triassic, but they were rare and obscure with there being many other strange marine reptiles that filled the oceans. However, at the turn of the jurassic the other marine reptiles would go extinct but the plesiosaurs became the dominant ocean going animals. So how did they become such a success when their peers went extinct

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Sources:
https://www.researchgate.net/publication/314290560_An_integrated_approach_to_understanding_the_role_of_the_long_neck_in_plesiosaurs
https://royalsocietypublishing.org/doi/10.1098/rsos.172177
https://www.sciencedirect.com/science/article/abs/pii/S0195667118302003
https://pubmed.ncbi.nlm.nih.gov/24256520/
https://www.nature.com/articles/ncomms4973
https://www.jstor.org/stable/3595510