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By Luana Mitten

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Extra resources for Rourke's World of Science Encyclopedia - 10 Volumes

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Roundworm bodies are tube-shaped. Earthworm bodies have segments. 14 Animal Life Arachnids, Crustaceans, and Insects Arachnids, crustaceans, and insects are the largest group of invertebrates. All these animals have bodies with several segments. They have hard shells called exoskeletons. They leave their shells, or molt, as they grow bigger. Then they make new shells. 3 A cicada emerging from its shell. Arachnids Arachnids include spiders, scorpions, mites, and ticks. They all have eight legs. Spiders live anywhere that there are insects to eat.

They include land snails and slugs. Clams protect themselves with a hard shell. Some mollusks protect themselves by making hard shells around their bodies. Squids and octopuses are the most complex mollusks. Starfish, also known as sea stars, are star-shaped organisms that have five arms. The skin on their bodies has many spines. This helps protect them from predators. Starfish move using tube like feet that are found under each arm. Each tube foot has a sucker at the end. The suckers allow starfish to stick to rocks and to hold onto prey.

Koala bear and baby. Opossums are the only marsupial native to North America. They have a long nose and a tail like a rat. Opossums can hang upside down by their tails. They often live near people and search garbage cans for food. Opossums will eat both plants and animals. 35 Animal Life Primates Humans belong to the group of mammals called primates. The other primates are apes, monkeys, and lemurs. Primates depend on their eyesight to find food or locate a mate. Their eyes are on the front of their faces.

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