Analisi del Market Share dell'azienda Ornithology per il mese di marzo 2026

Most birds are monogamous but polygamy (polyandry = many males/one female, e.g. phalaropes andpolygyny = many females/one male e.g. RW Blackbirds) are not uncommon. Promiscuous birds will mate with anybody of the opposite sex of the same species (e.g. Brown-headed Cowbirds). The birds may court and pair up during the winter (e.g. waterfowl) or find each other at the breeding grounds (most birds). The duration of the pair bond varies from one season to the next. Even as little as one copulation may be the extent of the pair bond; or the pair bond may last the life of an individual. If the same pair does nest year after year, it may be due more to the attractiveness of the territory or nest site rather than each other. Reliable evidence for true lifetime mating is scarce - it is hard to collect that kind of data. But there is some evidence for lifetime mating among eagles, wrentits, European nuthatches, thebrown creeper, and lyrebirds. Some pairs mate for several seasons while other pairs find new mates; this is true within one species as well as among species.