Question: Relative to its size, which owl has the longest legs?
Answer: It's the Burrowing Owl. Long legs are useful in excavating the burrows it uses for nesting sites, and for enlarging mammal burrows it sometimes uses.
Burrowing Owls frequently nest in small colonies. Often these are within ground squirrel and prairie dog colonies; hence, two other common names are "Prairie Dog Owl" and "Gopher Owl."
When disturbed in its burrow, it issues a dry, rattling call which mimics the sound of a rattlesnake's rattle. So another common name is "Rattlesnake Owl."