Animals need to consume food in order to obtain energy (just like humans.
Since the formation of the San Andreas Fault system 25-30 million years ago, the juxtaposition of the Pacific and North American plates has formed many faults in California that accommodate lateral motion between the plates.
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There are omnivores, carnivores, herbivores, and decomposes. Omnivores eat both plants and animals, carnivores eat animals, herbivores eat plants, and decomposers feed on dead material.