This is a picture of a lizard. A lizard is an example of an ectotherm, an organism that is dependent on external sources, such as sunlight or a heated rock surface, for body heat. In other words, an ectotherm cannot internally regulate its body temperature. The body temperature varies depending on the temperature of its environment. Examples of ectotherms are cold-blooded animals, including amphibians, reptiles, invertebrates, and fishes. A lizard is a reptile and therefore, an ectotherm.
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