Animals with backbones are called vertebrates. They have a bony skeleton under their skin and muscles, which provides a strong framework that supports their body and helps them move. They may look very different at first glance, but all vertebrate skeletons share some features, such as a skull to protect the brain.
Vertebrate animals can be either warm-blooded or cold-blooded. A cold-blooded animal cannot maintain a constant body temperature. The temperature of their body is determined by the outside surroundings. Cold-blooded animals will move around during the day between the shade and the sun to warm up or cool down. Cold-blooded animals are ectothermic, which means outside heat. Reptiles, amphibians, and fish are all cold-blooded.
Warm-blooded animals are able to regulate their internal temperature. They can sweat or pant to cool off and have fur and feathers to help keep them warm. Warm-blooded animals are called endothermic, meaning “heat inside”. Only birds and mammals are warm-blooded.
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