Barn owls are not federally endangered but their populations are low in Iowa. That could be because of habitat loss and prey loss because of agricultural and grassland changes. They were affected by DDT use in the 20th century and could also be susceptible to rodent poison, because rodents make up a main portion of their diet. Barn owls are also prey of the larger great horned owl, which is a major threat to the existence of barn owls.
They are an incredible creature and are easy to tell apart from other owl species because of their heart-shaped white face.
Barn owls do actually like barns as well as other abandoned buildings, rock cavities and densely treed areas, and they will search for prey at night by flying low back and forth over open habitat, listening for rodents to make sounds. They actually eat their prey whole, later regurgitating bones and other indigestible body parts in what is known as owl pellets — basically owl vomit. It makes it easy to see what a barn owl has eaten.
Female barn owls actually use their own pellets to make nests, shredding them and rearranging the pieces into a cup-shape for up to 18 eggs in a clutch. Barn owls may roost in the nest year-round, instead of simply using it to rear young. They are usually monogamous, staying with one mate for life.
Barn owls live around the world, and up to 46 different races have been described with the largest in North America weighing twice as much as the smallest in the Galapagos Islands.
Since they are pretty strictly nocturnal and have low populations in Iowa, you might not have seen one before. You may never have heard one either, although many people wouldn’t know it if they do. That’s because barn owls don’t have any kind of hooting call of a typical owl. Instead, the have a harsh scream that lasts about two seconds and a long hiss that is made when an intruder is getting too close. They also make sounds with their bills and wings to communicate.
They are called the eastern screech owl (Megascops asio), but that doesn’t mean all you’ll hear from them is screeches. Typically, these small owls only screech when they are defending their nest or fledglings. Otherwise, you will hear a variety of calls, including trills, whinnies, hoots and barks. They even make a clacking sound by…Read More
Great-horned owls may be the most well-known and most common owl in Iowa, but I don’t think there’s any disputing that the northern saw-whet owl is the cutest. Only slightly heavier than a hairy woodpecker and about the size of a robin, the saw-whet owl (Aegolius acadicus) is tiny and adorable. Saw-what owls hide easily.…Read More
There are nine species of owls in Iowa, and the great-horned owl (Bubo virgianus) may be the most well-known species. Great-horned owls have the quintessential owl call. When you think owl, you think “Whoooo. Whoooo.” That is actually not the call of every owl but the call of the great-horned owl. You can’t see their…Read More
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