In some species, both dad and mom care for nestlings and fledglings; in others, such care is the responsibility of just one intercourse. In some species, other members of the identical species—usually close family members of the breeding pair, such as offspring from earlier broods—will assist with the raising of the younger. Such alloparenting is particularly frequent among the many Corvida, which incorporates such Birds because the true crows, Australian magpie and fairy-wrens, but has been observed in species as totally different as the rifleman and pink kite. In birds, nevertheless, it is quite common—more so than in another vertebrate class. Although territory and nest website defence, incubation, and chick feeding are often shared duties, there’s sometimes a division of labour during which one mate undertakes all or most of a specific duty.