Northern Pygmy-OwlGlaucidium gnoma
In western forests, this little owl is often active by day. It may fly fast and low from one tree to the next and then swoop up to take a high perch, rather like a shrike. An aggressive hunter despite its small size, it catches more birds than most small owls. Little gangs of chickadees and other songbirds often gather to "mob" a pygmy-owl discovered in daylight, and they will react the same way to a birder who imitates the owl's whistled call.