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Animals are almost the same as human in energy transformations. They change food into thermal and mechanical energy. Due to this constant temperature is maintained in a body and animals are able to move.
Some animals use electricity to survive in nature. Many of these animals are found in the ocean where some use electricity to detect objects around them (sort of like seeing) and others use electricity to fend off predators or even hunt for food. One of the most famous of the electric animals is the electric eel.