ALWAYS IN SEASON: Mike Jacobs: Cooper's hawks thrive in city limits


What was a Cooper’s hawk doing in Houston?

It is a good query, and it might simply as properly be requested of Grand Forks. Cooper’s hawk has grow to be the raptor almost certainly in our city.

This can be a current improvement, and one which stunned birders and chook scientists, as nicely. The primary sentence of the species monograph in “Birds of North America” declares, “The Cooper’s hawk is a crow-sized woodland raptor.” That sentence was revealed in 1993.

That is concerning the time Cooper’s hawks started populating North American cities, together with Grand Forks.

Why would this occur?

Maybe the birds have been reacting to modifications in forest habitat. Maybe they have been responding to foraging alternatives in cities.

The chance can be straightforward prey, maybe a results of the expansion of fowl feeding as a interest. Small birds are likely to congregate at chook feeders, turning them into quick meals franchises for species that prey on small birds. Resembling Cooper’s hawks.

Anybody who’s walked each an alley in Grand Forks and a path in a Minnesota forest is aware of which has extra birds, and so do the hawks.

Straightforward transfer

Shifting from woodland to metropolis is not so massive a change. Cities are forested landscapes. Grand Forks has the most important focus of woodland between the Minnesota lakes nation to the east and the Devils Lake space to the west. To the northwest, the closest woodland is within the Pembina River Valley. To the south, it is within the Fargo metro.

The transfer to city is not the one change in Cooper’s hawk habits. In “Birds of Prey” (revealed this yr by Houghton Mifflin Harcourt), Pete Dunne writes, “I very respectfully take exception to” the label. Moderately than a woodland hen, he asserts, the Cooper’s hawk is an edge species that always hunts over open nation. He compares its searching habits to these of the harrier, a well-known chook in open grasslands right here and elsewhere in North America.

Dunne additionally speculates that dietary selection, not simply predator abundance, might have prompted the urbanization of Cooper’s hawks. Their favourite prey gadgets, he asserts, are members of the pigeon household, together with city pigeons and mourning doves. Traditionally, he notes, Cooper’s hawks dined on passenger pigeons, now extinct — although from human searching strain somewhat than predation by the hawks.

Cooper’s hawks may be met in lots of Grand Forks neighborhoods. I’ve seen them in Riverside Park on the north finish and close to Sertoma Park on the town’s west aspect. I’ve additionally met them in downtown East Grand Forks.

For probably the most half, the birds are migrants, however…



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