The Fortean Times magazine May 2010 pp75-76 has a very interesting letter from one Michael Price of Vancouver, British Columbia. It concerns the Kenneth Arnold sighting of 1947. Price states that he was the "...compilor/editor of the Vancouver Rare bird Alert in the 1990's." Researcher James Easton posed the question "If what Arnold had seen were birds, which birds could they have been?"
"I should stress that for decades I accepted uncritically the general consensus that Kenneth Arnold's assertion that they were artificial objects was unquestionable, yet following a recent re-reading of their behaviour rather than for his rather varying description(s) of their appearance in the context of James Easton's query, I knew immediately that he was describing the behaviour of very large birds in flight at long range in a set of particular light conditions...."
Price nominates the birds as being the American White Pelican, Pelecanus erythrorhynchos.
Dear readers, what do you think of this explanation?