Are turtles cetaceans

No, turtles are not cetaceans. Turtles are reptiles belonging to the order Testudines, while cetaceans, which include whales, dolphins, and porpoises, are marine mammals belonging to the order Cetacea. They have distinct biological and evolutionary characteristics, with cetaceans being warm-blooded and having adaptations for life in water, whereas turtles are cold-blooded reptiles.