A well-camouflaged little raptor, the Whiskered Screech-Owl’s U.S. population even managed to hide from scientists until almost the dawn of the 20th century. It’s easy to see why it took a while: Although a bit smaller and with slightly more heavily scalloped underparts, the Whiskered Screech-Owl very closely resembles the two other U.S. screech-owls, the Western and the Eastern. Once documented, the bird currently known as the Whiskered Screech-Owl was initially called the Arizona Whiskered Owl