Quadrupeds are animals with four feet, such as cows. Primates include humans and their closest mammalian relatives. The many species of apes, monkeys, and lemurs are among the primates. Cetaceans are ocean mammals, including whales and dolphins. Rodents , like squirrels and gerbils, have large front teeth for gnawing and cheek teeth for chewing.
Arachnids are arthropods, such as spiders, scorpions, mites, and ticks.
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