Image credit: Jan_Broz/Shutterstock.com. As the prey moves, so as the owl’s head to pinpoint the precise source of the sound. This pint-size owl weighs between 4 and 9 ounces, is mostly gray or reddish-brown in color and is about the size of a robin. Although this does not happen often, it can result because both the owls and the birds of prey are fighting over the same territory. The World's Largest Owl The Eurasian eagle-owl flying in the forest in the mountains low tatra. Other birds of prey such as hawks and eagles also feed on owls. You can tell what many owls eat by identifying bones, fur, feathers and insect parts contained in regurgitated owl pellets. Geography/Location: North America. The most important threat to the elf owl is habitat loss both of its riparian forest habitat and desert-scrub habitats. In fact, east of the Rockies, they can be found wherever there are trees, according to Cornell Lab. The more owls in one territory results in fewer resources. The largest Owl is the Great Horned Owl, standing around 2 feet tall with a 5feet wingspan, the Horned Owl is largely nocturnal inhabit, and therefore hunts during the night. The Great Horned Owl has a diet of up to 87.6% mammals in North America, and a Fox is firmly on that list. In Arizona, the elf owl is not uncommon, but it's numbers are decreasing in California and Texas. 6. Owls eat insects, spiders, scorpions, other invertebrates, reptiles, amphibians, fish, birds and mammals such as mice and rats. The three key species of threatened forest owls that live in areas of Victorian State Forest that VicForests operate within are thePowerful Owl (Ninox strenua), Masked Owl (Tyto novaehollandiae novaehollandiae) and Sooty Owl (Tyto tenebricosa). The diet of the barred owl varies immensely; they eat just about every type of animal in the kingdom Animalia, from mammals, reptiles, birds, amphibians, fish, and invertebrates. As owls tend to be nocturnal, the outstanding hearing sense help them to search prey on the forest floor even in a moonless night. If these owls infringe upon their territory, the snowy owl and great horned owl eat them in order to reduce competition. Small owls usually include insects and other invertebrates in their diet. The facial disc enables it to detect the prey. Small Owls. In order to protect these nocturnal birds, Owl Management Areas (OMAs) have been created across the forest landscape. Barred owls usually eat small to medium-sized mammals, but they will settle for birds and tiny insects if … Around the same time that foxes do. The screech owl can be found in most of Will County’s forest preserves unless the land is wide open, Bryerton said. eagles eat foxes Owls. Diet They feed primarily on invertebrates such as moths, crickets, scorpions, centipedes and beetles.