>Len and tweetsters, From what I've read and observed in the field the only
>way a redtail can hover is into the wind as opposed to rough-legs that can
>truly hover in still wind. As far as the reference to the king fisher size
I
>wondered at the time if Attenborough was referring to the local birds or
what?
>W.D. Thompson


I've been watching for a "hovering" answer and haven't seen one yet that
referred to temperature - as in [heat] thermals used by glider pilots - to
explain the ability of larger birds to hover in "still" air .....

Toni
Seattle