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Birds Vertebrates | Biology | Nature

To purchase this program please visit Segment from the program KIngdom Animalia: The Vertebrates. DVD Description Our Vertebrates DVD begins by looking at the evolutionary origins of vertebrates before going on to examine primitive aquatic vertebrates such as jawless hagfish and lampreys and the more sophisticated sharks and rays of class Chondrichthyes and the "bony" fish of class Osteichthyes. The program then studies evolutionary adaptations such as: changes in skeletal structure, skin and eggs resistant to evaporation, control of body temperature, and increased circulatory and cognitive capacity that one sees going from class Amphibia to classes Reptilia and Aves and on to class Mammalia.
Length: 05:19


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