Owls also have sharp hearing. Their ear openings are located asymmetrically on either side of their head, a configuration that gives them three-dimensional sound perception and enables them to pinpoint the slightest scuffle or rustle made by potential prey.
The elf owl is the world's smallest owl (about 5 inches long and 1.4 ounces). Other small owls include long-whiskered owlets, Tamaulipas pygmy owls and least pygmy owls.
The Eurasian eagle owl is the world's largest owl (measuring as much as 30 inches long, 79 inches wingspan and 10 pounds). Other large owls include Blakiston's fish-owls and Verreaux's eagle-owls.
Owls hunt prey that includes mammals, other birds, reptiles, and insects. They do not have teeth to chew their food and consequently swallow their prey whole. About 6 hours after feeding, owls regurgitate the indigestible parts of their meal as a pellet of bones, feathers or fur. Owl pellets often accumulate in the debris beneath their nesting and roosting sites.
Owls live on every continent except Antarctica. They inhabit a variety of terrestrial habitats around the world from the thick forest to the wide-open grasslands. Snowy owls inhabit tundra habitat throughout a circumpolar range in the Arctic.
Common barn owls, the most widespread of all owl species, live on every continent around the globe and inhabit temperate forests, tropical forests, coniferous forests and various types of grasslands and savannas.
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