How small is a elf owl compared to great horned owl?

The elf owl is one of the smallest owls in the world, with an average length of 5-6 inches (13-15 centimeters) and a wingspan of 9-10 inches (23-25 centimeters). The great horned owl, on the other hand, is a large owl, with an average length of 18-25 inches (46-64 centimeters) and a wingspan of 36-48 inches (91-122 centimeters). This means that the elf owl is about one-third the size of the great horned owl.