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Re: hovering diversity (was Re: Ornithurine diversity)

> I would say it is a combination of both.  There is not much
> point in 
> hovering in areas that don't provide good hunting, and
> you'd only hunt in 
> areas that have no exernal energy source available either
> when the hunting 
> there is very, very much better than average, or
> alternatively -- when you 
> are very hungry.
> JimC

I was refering in a more limited sense to their one dimensional position 
relative to the bluff - out in front in the smooth lifting air, rather than 
farther back where the airflow isn't so conducive to hovering/soaring.

Given the size of most bluffs/ coastal cliffs, and a birds excellent vision. I 
doubt they'd go anywhere but the easiest place to /hoversoar while scanning for 
food/hunting - since we aren't talking a huge distance, or much change in what 
they can see/perspective.

Obviously once prey/food is sighted, its position relative to the ridge will 
change as it attempts to get that food. I think until a food source is located, 
while ridge soaring and searching, their position relative to the ridge is 
primarily determined by the airflow