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Thread subject: Why do Ospreys fly Broad-front Migration?
||09/08/05 03:58 pm
||Here's a question for all to get involved in.
There must be several reasons for this. Care to add your ideas?
More migration trivia, courtesy of the Birder's Handbook, by Paul R. Ehrlich, David S. Dobkin, and Darryl Wheye.
While reading about osprey migration it was reported that ospreys were seen carrying fish on occasion during migration. That must be something to see. ;-)
Also larger birds, raptors don't fly as high as smaller birds, however, a story proves other wise. Whooper Swans were once seen at a dizzy height of 29, 000 ft . Reported by a jet pilot. Generally the advice throughout the bird kingdom is 'Fly low and slow,'' with speeds ranging from 20-30 mph. Air speeds range generally in the 10-40 mph range, so the migrating birds take advantage of this. Long distance migrating birds, generally start out at
5, 000 ft and rise to 20,000 ft , however those that wing their way through the Caribbean are mostly observed at 10,000 ft. Apparently birds can fly at altitudes that would be impossible for bats, since bird lungs can extract a larger % of oxygen from the air than can mammal lungs.
Enough for today. ;-)
||09/08/05 08:21 pm
||very interesting, and I am thinking........hmmm.