I suspect that the issue of high winds may be what occurs at the interface between higher winds slower moving air masses. Turbulence at these interfaces is going to be much more dangerous to birds I would think than laminar, organized air moving en masse in one direction. Steve Gast Houston, Texas segast23@xxxxxxxxx Edit your Freelists account settings for TEXBIRDS at //www.freelists.org/list/texbirds Reposting of traffic from TEXBIRDS is prohibited without seeking permission from the List Owner