(from the article `animal communication`) ...in the process of ritualization may have social or nonsocial precursors. The best known example of ritualization through increased usage is what ...
When one bird preens another. May solidify a relationship between individuals.
Mutual preening during which two birds preen each other, usually around the head and neck. In many species allopreening not only keeps the plumage clean and orderly, but also helps to establish social bonds between individuals.
Behavioral event where one bird grooms another bird of the same species. Also known as allogrooming.
Preening of one bird by another.