ROOSTING BEHAVIOR OF POSTFLEDGING VAUX SWIFTS IN NORTHEASTERN OREGON

In the first 3 wk after young Vaux's Swifts (Chaetura vauxi) in northe astern Oregon left the nest, 64% of adult swifts and 44% of juvenile s wifts roosted in the nest tree. The remainder of the time the, roosted in trees up to 9.2 km from the nest. Juveniles used more roost trees ((x) over bar = 2.0) than did adults ((x) over bar = 1.5), and went fa rther from the nest to a roost ((x) over bar = 3.3 km) than did adults ((x) over bar = 1.5 km). Some radio-tagged swifts left their nesting areas in Oregon in late August and early September and were found at l arge communal roosts sheltering more than 500 swifts. These large roos ts were used until mid-September when swifts left the study areas.