Duetting is a term derived from the word "duet" which means a musical performance, especially a song sung by two people.

Duetting however relates to animal communication

Animal communication

Animal communication is any behavior on the part of one animal that has an effect on the current or future behaviour of another animal. The study of animal communication, is sometimes called Zoosemiotics has played an important part in the...

, where the male and the female species of animals, especially birds, communicate using the song system. This may be used as a warning, a mating call or for any other purpose.