Herbivores are animals, such as deer, who eat plants. Invertebrates are animals without backbones, such as worms. Marsupials are families of mammals, such as kangaroos and opossums, whose females carry their young in an external pouch. Nocturnal animals, such as owls, are awake at night. Omnivorous animals, such as bears, eat meat and plants.
Pinnipeds are aquatic mammals with flippers, like seals and walruses.
Predators are animals, such as tigers, who stalk and kill other animals for food. Primates are mammals, including chimps, gorillas, and monkeys. Quadrupeds are animals with four feet, such as cows. Rodents have large front teeth for gnawing and cheek teeth for chewing, like squirrels and gerbils. Vertebrates are animals with backbones, such as horses.