can you describe the colour of the bird?
Its plumage colour is variable, depending on the subspecies and the region.
Red-tailed hawk
Red-tailed hawk plumage can be variable, depending on the subspecies and the region. 
when is mating season for red tail hawks The breeding season usually begins in late February through March. where are these birds mostly found? The Americas. which family do these birds belong to? Buteoninae.
wiki:13318588
Red-tailed hawk [SEP] Description
Red-tailed hawk plumage can be variable, depending on the subspecies and the region. These color variations are morphs, and are not related to molting. The western North American population, "B. j. calurus", is the most variable subspecies and has three main color morphs: light, dark, and intermediate or rufous. The dark and intermediate morphs constitute 10–20% of the population in the western United States but seem to constitute only 1–2% of "B. j. calurus" in western Canada. A whitish underbelly with a dark brown band across the belly, formed by horizontal streaks in feather patterning, is present in most color variations.