However, during winter, some species may be observed almost any time and in a variety of habitats because they are in search of food. Because most owls are active in times of low light or complete darkness, they have evolved a low-frequency vocal repertoire as a means of communication. Familiarity with these primary songs can greatly facilitate owl identification. Owls have evolved several important adaptations to help them cope with their lifestyle. Owls cannot move their eyes up, down, or side to side as humans can, so owls have evolved the ability to rotate their heads approximately 270 degrees.
Owls usually vocalize at low frequency.
These sound waves carry long distances and are not absorbed by barriers such as vegetation as quickly as high-frecquency vocalizations. The illustrations and accompanying text are designed to help you identify Montana owls and provide some basic life history. In North America, female owls are larger than males, with the exception of the burrowing owl. Determine if the owl has tufts or is round-headed. Note eye and bill color Note plumage color and other distinctive markings.