This non-native species was introduced to North America 100s of years ago. It is only found around human habitation as it apparently cannot find food or shelter elsewhere. It is a prolific breeder with four to five broods a year. The flat nest of stems and leaves is placed on a ledge, under eaves or bridges. It occurs together in often large flocks, and in some cities is the staple diet of Peregrine Falcons. Its natural color is grayish, but a wide variety of colors from white to black can be seen.
The four-digit banding code is ROPI.