The primary advertisement song. This is the major (male) vocalization.
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Northern Saw-whet Owl - Aegolius acadicus
The Northern Saw-whet Owl along with the Boreal Owl are the North American representatives of the genus Aegolius. The two owls are similar in appearance although the Northern Saw-whet Owl is smaller, has a reddish brown back, black bill, and chestnut chest streaking in contrast with the Boreal Owl's generally deep brown color and horn colored bill. The saw-whet's whitish crown streaking also set it apart from the Boreal Owl's white crown spotting. The sexes of the saw-whet are visually alike although they can be distinguished by voice. The juvenile Northern Saw-whet Owl is very different in appearance from the adult owl. It is a reddish brown color with a dark brown head and upper chest area, black facial disk with white from the top of the bill to the forehead. This owl lacks ear tufts but has a relatively large head. Its length is 8" (about the size of a Baltimore or Bullock's Oriole). This owl species is strictly nocturnal (active at night). Although secretive in behavior it is fairly common in North America and quite vocal through the breeding season.