How do animals communicate?

Dogs, bark, growl, and whine. Deer bell, mice squeak. When a bee has detected food, it informs the other bees by a kind of a dance, and whales inform each other by means of the whale song. Their sounds can be heard in water from several hundred kilometres. The communication of the whales has increasingly become difficult, because there are so many other sounds in the oceans now, like those of ships or of oil rigs. In general, animals of the same species communicate with one another without a problem; between species, there could be misunderstandings! For example, a cat purrs with satisfaction, but the dog may think that the cat is snarling at it!