Primary songs of some owls that “toot” or “trill,” in field guide format. Vertical axes in kiloHertz, horizontal in seconds. Click on each sonogram to hear the sounds depicted there. Numbered arrows are keyed to species text. All recordings from Cornell Laboratory of Ornithology's Voices of North American Owls (Vyn et al. 2006), presented with permission of CLO. Recording data in text: Voices of North American Owls disc number and track number, recordist, location, date, and Macaulay Library catalog number. Text, layout, and sonograms © Arch McCallum.

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Ferruginous Pygmy-Owl, Falcon Dam S.P., Starr County, Texas, 01 May 1995 Northern Pygmy-Owl, Wolf Creek, Josephine County, Oregon, 02 April 1995 Northern Pygmy-Owl, Madera Canyon, Santa Cruz County, Arizona, 09 July 1960 Northern Saw-whet Owl, South Slough Sanctuary, Coos County, Oregon, 21 May 1988 Boreal Owl, Fairbanks, Fairbanks North Star Borough, Alaska, 17 April 1969 Whiskered Screech-Owl, Carr Canyon, Cochise County, Arizona, 19 May 1987 Western Screech-Owl, Coppei Canyon, Walla Walla County, Washington, 30 December 1989 Eastern Screech-Owl, Clear Spring, Washington County, Maryland, 23 July 2000 Field Guide Page: Small Owls That Toot or Trill