Gymnogyps californianus July 20,1946 Breckenridge mtn, Calif. clear flight path is provided. Large lead conifers higher on the slopes, & near the road, showed no whitening of corvus-like nature. Condors, like aircraft, have a certain "radius of action" and must have bases (roosts) from which to wake. These are distributed throughout their range - Indian Creek, Breckenridge mtn., Bopper Canyon, Sigquice, McCheney mtn., Castle Mtn. - 4 possibly others - all rather equally distributed in linear miles. The two immature had worked their way to top of their tree - about 7:30 they left from a perch on tip top of a green pine 100 ± yds. downhill, then left about 7:35. The adult remained on same perch or when I first saw it, & preened. Sky 4/10 alto - cumulus + clearing; no wind. Though near the road, these roost trees are well screened from public view by large conifers near road side. Little traffic on the road no - since 5 p.m. yesterday, perhaps 5 cars beside mine. There are granite outcroppings in Lucas Creek canyon which might afford nesting cover, but no whitewash apparent on these. The roost trees are conspicuous by their whiteness - they are barkless & mostly quite straight, about 100' high, with few sparse or stub branches of about 4" diameter (perhaps 6"). A man who had a house at Pine Saddle rode by; I asked him if there were any condors around here - he said "no condors, but quite a few eagles". I didn't disillusion him. 8:05, the adult lay flat on its limb perch, facing up canyon. Air calm still. Perch branch was about 6' from top of the