"Mystical Photography by Frederic Larson
Leaving a Trail
February 27 2011
A lone seagull seemed to follow one of many paths left in the sky by jet airliners.
For those who are curious, these trails are actually called "contrails" and are formed by the injection of water vapor into the atmosphere by exhaust fumes - or actually, ice crystals. Needless to say, they add an interesting dimension to photographs."
http://www.sfgate.com/cgi-bin/blogs/photoblogfl/detail?entry_id=14598
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