[Tweeters] Turkey Vulture Question

[Dennis and Julia O'Connor]

Here in the Okanogan over that last week I have seen two different 
turkey vultures (one on the way to Twisp on Monday and one along 
Highway 97 by Okanogan--yesterday) that were perched atop telephone 
poles--standing with wings spread wide for several minutes-(they were 
not taking off, not landing, not flapping,--they just appeared to be 
sun bathing).  Is this part of a mating display?  Are they simply 
warming their bones?

Just curious--

Julia O'Connor