if it is a carnivore it feeds on other animals if it is a herbivore when one animal dies it breaks down and gives the plant nutrientsalso using symbiosis
Pretty much all animals do. For instance, a gander might protect it's mate, a goose, if the goose is threatened.
With different mating call and communication calls.
Portugese Man of War It is made up of multiple different fish put together. It is a type of jellyfish.
they can communicate with the same animals they are. some can communicate with others.