Reptiles and amphibians (Reptilia and Amphibia) are classes of animals that have cold blood (they do not create their own body heat, but rely on the sun for warmth). Reptiles and amphibians are often thought of as slimy, but in fact reptiles usually have dry, scaly skin, while only amphibians need to keep their skin wet. They thrive over much of the Earth's surface, but cannot survive in polar regions. Amphibians are particularly threatened by climate change.
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