Northern Harrier (Circus hudsonius) 17 November 2017 at Staten Island, San Joaquin County, CA Photo © 2017 Joseph Morlan
Northern Harrier (Circus hudsonius)
In accord with AOS-NACC (Chesser et al. 2017), Northern Harrier Circus cyaneus is split into two monotypic species: Hen Harrier Circus cyaneus, and Northern Harrier Circus hudsonius. This split is based on "differences in morphology, plumage, and breeding habitat (Grant 1983, Thorpe 1988, Dobson and Clarke 2011, Etherington and Mobley 2016) commensurate with differences between other recognized species of Circus" (Chesser et al. 2017).

Canon PowerShot SX50 HS.
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