Cold-blooded animals are animals that rely on the outdoor temperature to determine their own body temperature. Most cold-blooded animals are invertebrates. Invertebrates are animals without a backbone. That means that they are the opposite of vertebrate animals. Invertebrates make up 95% if the Earth’s animals! Some invertebrates have a hard covering on the outside of their bodies called an exoskeleton. Besides that, invertebrates are usually creatures that do not have bones as a support. Cold-blooded animals are exothermic animals meaning that they rely on the outside temperature. That is why vertebrate animals stay in the water when it is hot and stay under the Sun when it is cold.
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