Juvenile barn owl (Tyto alba) inside its nest - a screeching owl.
Owls are divided into two main groups or families, the Strigidae and Tytonidae. The tytonids are screeching owls and include the grass and barn owls in southern Africa. These owls have long slender bills, smaller, dark eyes and a pectinate claw for preening. The strigids include all other owls and either hoot or have a whistled call. They have enormous eyes, stouter bills and no pectinate claw.