Does Tweeters need to retain a geologist on this Black Swift query? I
wonder if this species might show an affinity to certain rock types for
nesting. Which might also bring in the mountaineers! Maybe Oregon, much of
which is compsed of volcanics (at least in the wet regions that would
attract Black Swifts); this rock type might be somehow not to BLSW for
nesting. Just a thought...
Andy Stepniewski
Wapato, WA