INTRA-YEAR REUSE OF GREAT HORNED OWL NEST SITES BY BARN OWLS IN EAST-CENTRAL COLORADO

Barn owls (Tyto alba) sequentially reused nest sites of great horned o wls (Bubo virginianus) within the same breeding season on two occasion s in east-central Colorado during 1982 and 1983. Two of 22 cliff nest sites used by great horned owls during the 2-year period were subseque ntly reused by barn owls, while no red-tailed hawk (Buteo jamaicensis, N = 8) or common raven (Corvus corax, N = 20) cliff nests were sequen tially used by barn owls. In temperate latitudes, only rarely are symp atric raptor species expected to exhibit breeding behavior that could accommodate intra-year sequential nesting at the same site.