Typical owls vary greatly in size. The smallest is the Elf owl. Its weight is a hundred times less than the largest, the Eurasian Eagle owl and Blakiston's Fish owl. Most owls have very similar bodies. They have large heads, short tails, and round facial circles around the eyes. Most live in trees (with a few exceptions like the Burrowing owl) and get their food on the wing. The wings are large, broad, rounded and long. Like other birds of prey many owls have females that are larger than males.