A: The answer to the first part of the question is yes and no, according to Scott Craven, UW-Madison professor emeritus of forest and wildlife ecology. “Crows are territorial during the nesting season from March into May. During nesting they are much less conspicuous than during the rest of the year. “For most of the year crows are gregarious. They spend the night in large communal roosts consisting of hundreds to sometimes thousands of birds. Roosts are usually located in woodlots, parks or quiet places with large trees.