There are tons of sea animals, and some of them are endangered. For example, people used to hunt hawksbill for its shell, they are endangered. Secondly, sailors probly thought that dugongs were mermaids. And to sum it up, there are 3,000 types of nudibranches. As you can see there are endangered and lots of sea animals.
Sea animals have very good ways to protect themselves here’s some ways. For example, coral polyps can be smaller then then a head of a pin. Secondly, Some nudibranches have bright colors witch sends a message that there poisonous. To sum it up, some nudibranches can sting there predators because of the animals they eat. As you can see sea animals have great ways of protecting themselves.