True owl Morphology
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. Handbook of the Birds of the World. They have large heads, short tails, and round facial circles around the eyes. The wings are large, broad, rounded and long. Like other birds of prey many owls have females that are larger than males. Earhart, Caroline M. and Johnson, Ned K. 1970.