Crows commonly gather together to roost. The birds typically create communal sleeping groups when the breeding season has come to an end.
Often the crows will gather in large groups before making it to their roosting spot. Once the nighttime settles in, the group makes their way to a safe spot to sleep. The process is not always peaceful, however, as the crows sometimes fight one another. Large groups of crows are more often seen in winter and fall months as during the breeding season, the crows tend to stray off on their own to built suitable nests. During breeding seasons, crows are territorial of their nests, but these are abandoned as the weather begins turning cold. Sometimes, crows will also group up if they feel threatened or an abundance of food is found in one spot such as large fields of vegetation.While some species of crows migrate, the majority stay put all year long. Crows are found all through the United States, and only have a life span of under one year on average. The majority will die before hatching or as nestlings. Crows only breed one time per year and average three to four eggs at one time. The entire process takes nearly four months since the eggs incubate for 20 days and will not hatch for another 35 days.