Most owls are nocturnal, and they use their voices to establish territories and attract mates in the dark. Several species begin nesting as early as midwinter, which is one reason why you can often hear them in fall and winter, when most other birds are quiet. Listen to the calls of the Barn Owl, Eastern Screech-Owl, Western Screech-Owl, and Barred Owl while focusing on detailed photo portraits, then practice to see if you can identify each distinctive call.
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