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. Controls will appear in window at top right. 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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