Give examples of representatives of an aquatic habitat and describe one of them.

As you know, in the aquatic environment, be it a river, sea, lake or ocean, there are various living organisms that live there – from the simplest to mammals. Here are examples of animals in the aquatic environment: hydra, leech, daphnia, copepod crustaceans, rotifer, ciliate shoe, swimming beetle, water strider, beaver, walrus, whale, needle fish, cancer, otter, manatee, hippopotamus, crocodile, tuna, carp , sturgeon, seal, crab, octopus and others. Let’s describe, for example, the sperm whale. The sperm whale is a huge mammal weighing under 50 tons and 20 meters long, females are noticeably less than 20 tons and 15 meters long. The appearance of the sperm whale is very peculiar: it has a large rectangular head, body color is gray or light brown in different variations, the blowhole is located not on the top of the head, but in its front part, the lateral fins are small, the pectoral fins are short and wide, the tail is large and powerful.