Saw-whet Owls compete with their family member the Boreal Owl, as well as Starlings and Squirrels, for cavities they enjoy nesting in. Both owls appear very similar, however Boreal owls have a black-tipped facial disk and Saw-whet owls have a white heart between their eyes.
Saw-whet Owl adults stand at a formidable 20cm and feed on small mammals; voles, deer mice, squirrels. It will supplement it's diet eating small songbirds and will even eat something as large as a pigeon.
They can mostly be heard during the Springtime, but they vocalise all year round, so keep an ear out!