This document discusses crustaceans such as crabs, lobsters, and shrimp. It provides details about their physical characteristics like antennae and mandibles for feeding. It also describes their habitats in freshwater and marine environments near sand, rock, and mud. Their hobbies are listed as escaping fishermen and seeing scuba divers. The document highlights their adaptations to both aquatic and terrestrial environments as well as their unique features like compound eyes and strong claws.