Birds participate in such behaviors as cooperative breeding and hunting, flocking, and mobbing of predators. Most bird species are social and breed in large groups. Birds produce offspring by laying eggs which are fertilized through reproduction. They are usually laid in a nest and incubated or tended to by by the parents. Most birds have an extended period of parental care after hatching.

Many species of bird have been protected while others are protected only during their baby season. Birds are important to our ecosystem but are also recognized as nuisance pests when the population grows too large..