Elf owls are a species of owls found in the western United States and Mexico. They are known for their tiny size, averaging just 5 inches in height. They are also known for their preference for living in cacti, where they make their nests. Their nests are usually found in the cactus's branches, where they are protected from predators and the harsh desert environment. The owls use their sharp talons to grip onto the cactus's spines, allowing them to stay securely in place.