Circus approximans Peale 1848 (swamp harrier)
PaleoDB taxon number: 372508
Belongs to Circus according to J. F. Clements et al. 2017
Sister taxa: Circus aeruginosus, Circus cinereus, Circus cyaneus, Circus dossenus, Circus eylesi, Circus hamiltoni, Circus hudsonius, Circus macrourus, Circus maillardi, Circus spilonotus, Circus teauteensis