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Message: <blockquote data-quote="ceasar" data-source="post: 1504535" data-attributes="member: 26155">In North America this bird, because of it's 4 field marks, would be accepted as a Red-tailed Hawk with little or no discussion.Additionally, we don't see much discussion of any hybridization of them with other NA Buteos either. Wheeler's books do discuss intergrades among the various RTH subspecies.  The various color morphs within each subspecies would affect color changes in the secondaries and other parts.The RTH was introduced in Europe for Falconry purposes, I understand.  I would hazard a guess that there have been some serious attempts to hybridize them with the Common Buzzard.  (Curiously, this bird seems to be more like a RTH than any of the other NA Buteos.)  If successful it would, no doubt, result in some structural differences such as the ones discussed here.  Also,  It would be no surprise if some of these birds escaped.I'll let this open for more discussion.Cordially,Bob</blockquote>