For such a small owl, the Northern Saw-whet has a lot to say. And a lot of ways to say it. Males weigh about as much as an American Robin. And they send out at least 11 different calls, including “toot-toot-toot” advertising calls, from late January through May. The rate of calling is partly determined by the nighttime temperature. And perhaps to keep other Saw-whets out of a food-rich territory, males may toot more frequently when their favorite prey, white-footed mice and deer mice, are plentiful.

More info and transcript at BirdNote.org. 

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