Animals have a very diverse way of communicating across species. They can transmit information from one to another using physical or chemical signals. The way they communicate is important for understanding their behaviors. Whales for instance have a number of communication tactics.

Whales will partake in a variety of physical signals. They will sometimes surface, leaving most of their body out of the water — this is called breeching. There are many theories as to why they do this including: communication, warning, male attraction etc. Another way is fin slapping or tail flapping against the water which can be interpreted as a sign of aggression.

Auditory signals are another way animals can physically communicate. Birds use sounds and calls often to convey warnings or messages to other members of their populations. Some bird species produce vocalizations that are similar throughout and are song-like. Many frogs such as bullfrogs use loud croaks to attract mates from long distances.

There are a variety of reasons animals use signals and calls to communicate with each other. Obtaining mates, defending territory, and caring for young are among the most important reasons for animal communication.

References:

https://www.khanacademy.org/science/biology/behavioral-biology/

https://www.wildaboutwhales.com.au/whale-facts/about-whales/whale-behaviour

Lecture Notes 10/10/19: Animal Communication