Crows are committed nest builders. They typically build nests in trees, twenty to sixty feet off the ground. The nest consists of sticks and twigs with shredded bark, grass or a similar material lining it. Crows have one or two broods a year, averaging four to seven eggs per brood. Incubation takes eighteen days with a four to five week fledgling period before the young leave the nest. The eggs range from pale bluish-green to olive green or greenish-brown with splotches of brown and olive-gray. Migratory in upper

parts of the country. Northern birds will fly thousands of miles south during the winter, while southern birds stay put year round. One notable characteristic about Crows is their flocking behavior. In fall and winter they will move to better feeding areas where they will coalesce into massive feeding flocks. These feeding flocks in turn, join up with other flocks at night to form enormous communal roosts numbering from a couple thousand to tens of thousands.