This owl, like some other species, will call in the daytime as well as at night. Usually the calls are heard in a series of eight, then silence, when the owl listens for a reply from other owls. The Barred Owl belongs to the Order Strigiformes which includes all birds that have eyes fixed in their socket, a large head and short neck. Most, but not all, are nocturnal. They are also members of the Family Strigidae.
Owls appear to be able to rotate their head completely around.
This total rotation is just an illusion. Often, they sit with their head looking over their shoulder to prevent predators from sneaking up behind them. If they hear a noise which they can't see the source, they will turn their head quickly to the front, then to the other shoulder. This rotation is about 270 degrees of a circle, not 360 degrees. For comparison, a flexible human can turn their head less than 180 degrees.