Are dinosaurs true members of the reptile class?

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Turtles are marvelous organic creations and very worthy objects for contemplation, but turtles aren’t dinosaurs. (real animatronic dinosaur)Turtles have a scaly skin and a leathery or porcelaneous egg, points of resemblance to both lizards and crocodiles. But the body architecture of the turtle is so thoroughly unique that after nearly two centuries of research, turtle relationships are murky at best.

 

Are dinosaurs true members of the reptile class? Good question. (dinosaur suit for adult)Hard to answer—that’s what this book is all about. The late nineteenth-century naturalists defined Reptilia by blood, skin, and sex. If an animal had “cold blood,” skin covered with scales, and laid eggs on land, then it was a true reptile. (realistic dinosaur costume)Despite the obvious similarities of design between crocodiles and birds, therefore, the scaly, naked hide of crocodiles and their “cold blood” have persuaded most naturalists to separate them from the birds. Birds have their own class, the Aves. But crocodiles are left in the Reptilia with their more distant relatives, lizards, snakes, and turtles. Birds and mammals differ from each other in extraordinarily numerous ways, in nearly all details of their joints, muscles, and other organs. (animatronic dinosaur for sale)But birds and mammals do share two key adaptations which color their entire evolutionary style: both have insulation for the skin (feathers for birds, hair for mammals) and both are “warm-blooded” (they have such a high metabolic rate that their bodies are generally heated from the inside). Mammals have their own zoological class. Although the “warm-bloodedness” of birds and mammals is very similar in physiological detail, it is quite clear that the “warm-blooded” condition evolved separately, once in birds, once in mammals.