La Brea Bird Bones points Plesiosaurs were marine reptiles that

Plesiosaurs were marine reptiles that appeared in the Triassic and died out along with the dinosaurs at the end of the Cretaceous period

probably killed them off

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preying on small marine organisms like crustaceans and fish

La Brea Bird Bones points Plesiosaurs were marine reptiles thatSandhill Crane Ulna and Neck Vertebra & Redhead Duck Humerus Late Pleistocene epoch Approx. 20,000 30,000 years old Rancho La Brea Formation Maricopa, California Specimen approx. size: 5. 25" x 2. 5" x 2. 25" Due to their fragile nature, bird bones are relatively less common in the fossil record than those of other taxa. However, thanks to the preservative properties of asphalt, Rancho La Brea has one of the worlds largest collections of fossil birds,