The discovery that the Eastern (Otus asio) and Western (O. kennicottii) Screech-Owls are incipient (Marshall 1967) if not full species (AOU 1983) motivated field ornithologists along the presumed Rocky Mountain contact zone to learn how to distinguish the two and to determine their distributions. Progress toward this determination has been slow in Wyoming because there are few field ornithologists available to do the necessary studies. With this in mind, I sought to find evidence for these species from previous work and surveyed appropriate habitat to contribute original information.