fish
суббота, 17 июля 2010 г.
Many falconiforms pair for life; others, notably migran.... speci usual
The breeding pattern follows the usual sequence of nuptial display, nest building, incubation, fledging period, and postfledging period. The length of the breeding period varies from about 3 months in the smallest species to over 15 months in condors, crowned eagles, and probably harpy eagles. No species regularly produces two broods in a season, but second broods have been recorded, even in some large species. Most species perform several types of display, but species inhabiting woodland or forest display more often and more vociferously than related species of open country. All members of the family Accipitridae, as well as s, the osprey, and the secretary bird, construct nests, usually of sticks. The Cathartidae and the remaining Falconidae (forest falcons, falconets, and true falcons) do not make nests but use a hollow tree, another bird's nest, or a scrape on a ledge. Small species usually build a new nest annually; large species tend to return to and repair an old nest! . Falconiform eggs are rather large for the size of the birds and are usually rounded white or greenish ovals. The longest postfledging periods known are in and condors; in the crowned eagle the young remain dependent for 9 to 11 months, and this species normally breeds only every second year. speci usual
Подписаться на:
Комментарии к сообщению (Atom)
Комментариев нет:
Отправить комментарий