Invasion?

In an emai today I am reminded of the Ennis Cristmas Bird Count in which we saw 31 Rough-legged Hawks.Snowy Owls and Gyr Falcons have been seen in open areas throughout the west and midwest. These arctic densions are known to invade this area when food is scarce where these birds winter in the north.
One of the theories I have heard is that global climate change is melting the perma frost and thus the nesting habitat and reducing popultions of prey species…and thus these northland species are headed “south” in search of food…This sounds plausable if we determine we are being invaded from the north.
Matt

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