Perhaps the most impressive altitude record is that of a flock of Whooper Swans which was seen on radar arriving over Northern Ireland on migration and was visually identified by an airline pilot at 29,000 feet. Birds can fly at altitudes that would be impossible for bats, since bird lungs can extract a larger fraction of oxygen from the air than can mammal lungs.
Thank you. I appreciate you pointing that out to me.
51 posted on 09/15/2007 9:05:09 AM PDT by DoughtyOne
((Victory will never be achieved while defining Conservatism downward, and forsaking its heritage.))