Albinism occurs, producing pure or partial white coloration. Crows are found in Pennsylvania year-round. Crows that breed here migrate south starting in late September or early October and are replaced by birds from the north. Northern migrants remain in our state over winter while crows born in Pennsylvania fly as far south as the Gulf of Mexico. Flocks of crows range widely for food, up to 30 miles a day in winter.
Crows have extremely keen senses of sight and hearing.
They are wary and usually post sentries while they feed. Sentry birds watch for danger, ready to alert the feeding birds with a sharp alarm caw . These skillful fliers have a large repertoire of moves designed to throw off airborne predators. Crows are relatively gregarious. Throughout most of the year, they flock in groups ranging from family units to several hundred birds.