Hawks

The Red-tailed Hawk reaches Sexual_maturityat two years of age. It is Monogamous, mating with the same individual for many years. In general, the Red-tailed Hawk will only take a new mate when its original mate dies. The same nesting territory may be defended by the pair for years. During courtship, the male and female fly in wide circles while uttering shrill cries. The male performs aerial displays, diving steeply, and then climbing again. After repeating this display several times, he sometimes grasps her Talonbriefly with his own. Courtship flights can last 10 minutes or more. Copulation often follows courtship flight sequences, although copulation frequently occurs in the absence of courtship flights.

In copulation, the female, when perched, tilts forward, allowing the male to land with his feet lodged on her horizontal back. The female twists and moves her tail feathers to one side, while the mounted male twists his cloacal opening around the female's cloaca. Copulation lasts 5 to 10 seconds and during pre-nesting courtship in late winter or early spring can occur numerous times each day.

In the same period, the pair constructs a stick Bird_nestin a large tree 4 to 21 m off the ground or on a cliff ledge 35 m (115 ft) or higher above the ground, or may nest on man-made structures. The nest is generally 71 to 97 cm (28 to 38 inches) in diameter and can be up to 90 cm (3 ft) tall. The nest is constructed of twigs, and lined with Bark, pine needles, Corn_cob, husks, stalks, Aspencatkins, or other plant lining matter.

Great Horned Owls compete with the Red-tailed Hawk for nest sites. Each species has been known to kill the young and destroy the eggs of the other, but in general, both species nest in adjacent or confluent territories without conflict. Great Horned Owls are incapable of constructing nests and typically expropriate existing Red-tail nests. Great Horned Owls begin nesting behaviors much earlier than Red-tails, often as early as December. Red-tails are therefore adapted to constructing new nests when a previous year's nest has been overtaken by owls or otherwise lost. New nests are typically within a kilometer or less of the previous nest. Often, a new nest is only a few hundred meters or less from a previous one. Being a large predator, most predation of these hawks occurs with eggs and nestlings, which are taken by Owl, Corvidand Raccoon.

A clutch of 1 to 3 Egg_(biology) is laid in March or April, depending upon latitude. Clutch size depends almost exclusively on the availability of prey for the adults. Eggs are laid approximately every other day. The eggs are usually about 60 x 47 mm (2.4 x 1.9 in). They are Avian_incubationprimarily by female, with the male substituting when the female leaves to hunt or merely stretch her wings. The male brings most food to the female while she incubates. After 28 to 35 days, the eggs hatch over 2 to 4 days; the nestlings are Altricialat hatching. The female broods them while the male provides most of the food to the female and the young, which are known as eyasses (pronounced "EYE-ess-ess"). The female feeds the eyasses after tearing the food into small pieces. After 42 to 46 days, the eyasses begin to leave the nest on short flights. The Fledgeperiod lasts up to 10 weeks, during which the young learn to fly and hunt.