This species and B. nitidus sometimes placed in Asturina, partly because of distinctive moult pattern. Probably closest to B. ridgwayi and B. lineatus; previously considered to form a clade with these and Rupornis magnirostris, but latter found to be basal to all buteos#R#R#R, and this group may be more closely allied to Leucopternis than to Buteo. Until recently was commonly considered conspecific with B. nitidus, but differs in its plain vs barred grey crown, nape, back and wings (3); uppertail-coverts white vs grey with white tips, resulting in bold vs narrow white band on base of uppertail (2); longer call, without sudden drop in pitch in middle of note (2, perhaps 3)#R. Monotypic.
SW USA (SE Arizona and S Texas) to NW Costa Rica.
Food and feeding
Status and conservation
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