Baleen whales filter feed plankton. Plesiosaur Plesiosaurs were flippered marine reptiles from the Mesozoic Era - they were not dinosaurs. Pod A pod is a social group of whales. Baleen whales travel alone or in small pods. Poikilotherms Poikilotherms are animals whose internal temperature changes depending on the environment.
Reptiles are poikilothermic.
Polyphyletic A polyphyletic group consists of organisms but not their common ancestors. This is an artificial group which is based primarily on physical characteristics rather than on evolutionary relationships. Porpoise Porpoises are small cetaceans that have a short, beaklike snout or no snout, a triangular dorsal fin, and spade-like teeth. It is the time from when the Earth formed until simple life-forms evolved. Predator A predator is an animal that hunts and kills other animals for food.