National Geographic : 1935 Feb
SILENT-WINGED OWLS OF NORTH AMERICA © National Geographic Society HOBGOBLIN OF THE DARK IS THE POORLY NAMED SCREECH OWL A high-pitched quavering note is its nearest approach to a screech, but the uncanny call sometimes stirs the superstitious, who go to fantastic ends to break its "evil spell." Because these small birds destroy harmful mice and insects, they bespeak man's protection. There is no satisfactory explanation as to why the eastern screech owls (lower pair) develop the two plumage phases, red and gray. Kennicott's (top with young) inhabits northwestern North America.