Red foxes have binocular vision, but their sight reacts mainly to movement. Their auditory perception is acute, being able to hear black grouses changing roosts at 600 paces, the flight of crows at 1/4-1/2 km and the squeaking of mice at about 100 meters. They are capable of locating sounds to within one degree at 700-3,000 Hz, though less accurately at higher frequencies. Their sense of smell is good, but weaker than that of specialized dogs