The range expansion of the Barred Owl (Strix varia) into California is being documented incidentally during the annual monitoring of the Northern Spotted Owl (S. occidentalis caurina) and the California Spotted Owl (S. o. occidentalis) at sites of timber sales and demographic studies in northern California and along the Sierra Nevada. Barred Owls were first recorded in northwestern California in 1981 and have subsequently been observed over much of the northern third of the state, as far south as Nevada County in the Sierra Nevada (Dark et al. 1998) and Marin County along the Coast Range (D. Adams, Point Reyes National Seashore, pers. comm.) (Figure 1).