This female great horned owl is keeping her owlets warm. In a couple weeks, they will be big enough for me to get a peek at them. Great horned owls are opportunistic nesters. They will take over abandoned bird nests, squirrel nests, and even man-made nests as this family has done. Great horned owls have a 5 mile radius of territory, which means this lady, her mate, and their owlets are the only great horned owls for five miles.