甲壳类 触角 小龙虾

antennae crayfish crustaceans The feelers on a crayfish are antennae. Crustaceans are a class of mostly aquatic animals that have hard, flexible shells, jointed legs, and two pairs of antennae. antennae The feelers on a crayfish are antennae. crayfish A freshwater animal that has a hard shell and prominent pincers.

壳 游水器 钳子

carapace pincers swimmerets The main body shell of crustaceans. Crayfish have small leglike structures under the tail called swimmerets. pincers Pincers are the big jointed leglike structures in the front of the crayfish.

伊乐藻 栖息地 行为

elodea habitat behavior Elodea is a kind of aquatic plant that crayfish eat. habitat Where an animal lives is its habitat. behavior Things that animals do are behaviors.

生命 循环

Life cycle The sequence of changes undergone by an organism as it develops from its earliest stage to the same stage in the next generation.

领土 黑蜣 昆虫

territory bess beetle insect The territory is the part of an animal’s habitat that it defends against others of its own kind. bess beetle Bess beetles have six legs, three body parts, two antennae, two jaws, and a horn. insect A small arthropod animal that has six legs and generally one or two pairs of wings.

胸腔 腹部 头

thorax abdomen head One of the segments of an insect.