The species in this group are nocturnal raptors commonly known as owls, barn owls and little owls. There are about 250 species in this group. They are cosmopolitan and inhabit almost every type of habitat, from marshes to temperate forests to ice fields. These birds have highly developed talons on their zygodactyl feet, their opposing digits allowing them to grasp their prey firmly. They have a facial disc whose feather structure helps to enhance their sense of hearing. They also have tremendous vision in semi-darkness. The position of their eyes forces them to turn their heads in almost every direction to observe their surroundings. With their silent flight, they are formidable hunters.