Raptor Pictures Boreal Owl This small, secretive owl is considered one of the rarest of owls. It is entirely nocturnal, spending the day concealed in dense spruce or a hollow tree. It preys mainly on rodents. Burrowing Owl The burrowing owl makes its home in the treeless, shortgrass country of western North America, from southern Canada to Mexico. It depends mainly on the abandoned burrows of prairie dogs for nesting sites and shelter. Northern Spotted Owl To breed and raise its young, the northern spotted owl requires up to 100 acres (40.5 hectares) of old-growth forest.