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As a lover of hawks I must butt in:
>I understand that the hawks that do so (red tails?) only do it in
>marginal environments (ie, they don't show the same mutual attack
>strategies in better stocked enviromnents) and that this is not
Actually, its very rare to see a red-tail (Buteo jamaicensis) hunt with
others of its kind. B. jamaicensis does hunt in margins, taking
advantage of a high perch to eye the grass below for its rodent,
poultry, and snake prey. It is also a soarer, one of the few hawks that
habitually does so. As for habitat, in the East and Midwest it has a
very narrow habitat, nesting in high trees and hunting in the way and
locations described above. Out West, however, it is more varible in
habitats, generally filling up all available space. B. jamaicensis is
also RSD ( reverse sexual dimorphic ), where the females are larger.
During nesting, it seems that the males hunt more.
The best example of a cooperative hunter in the falconiform world is the
Harris hawk (Parabuteo unicinctus). It flies close to the ground and
has a reputation of being fearless. Usually two individuals cooperate
in a low-level attack.
There are also many hawks that hunt in closed forests, such as the
sharp-shinned hawk (Accipter striatus), which hunts in coniferous
forests after songbirds. The goshawk (Accipter gentilis), the merlin
(Falco columbarius), and especially the broad-winged hawk (Buteo
platypterus) all hunt in the woods.
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