They swim in schools.
Some have colors that help them blend in to their surroundings. Others change colors to match their surroundings. Some swim very fast to escape the danger. Some fish swim in very tight schools to confuse other fish. Some fish hide in the rocks and plants so the bigger fish cant get to them. Some fish can hide in poisonous anemonies and they are not affected by the poison but other fish are.
Mermaids are completely made up. They are not, and have never been, real creatures. Most likely, "mermaids" were seals or walruses sitting on rocks sunning themselves.
They protect themselves by squirting ink.
Citizens protect themselves with police departments. Nations protect themselves with a military.
how do lionfish protect themselves
they use their sting tail to protect themselves
no, they protect themselves XD I have to laugh at that, but it is true they protect themselves.
Barnacles protect themselves by sticking to something sturdy.
dont think they can protect themselves
They protect themselves with their horns, made with really strong bones , and thick skin used as a shield to protect themselves.
I think they protect themselves by their height,or attract other bugs that kill the pest. Or standing still. They also protect themselves by pulling in their long flowers to protect the seeds.
No, dragons are fictional creatures just like mermaids, werewolves and Santa Claus.
People can protect themselves by moving to higher grounds