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Rick TaylorWilliamson's book is a comprehensive treatment, accurate enough to satisfy professionals and accessible to the lay reader.
— Birding Magazine
"Williamson's book is a comprehensive treatment, accurate enough to satisfy professionals and accessible to the lay reader." Birding
This large hummingbird of eastern Mexico ranges north into southwestern Tamaulipas, the presumed origin of several other tropical species that have strayed into southern Texas; the potential exists for occurrence north of the Mexican border. The species gets its name from the modified shafts of its outer primaries, which are dramatically thickened and curved in adult males, less so in immature males and adult females. The function of this feature is unknown, though it may play a role in sound production or visual signaling during courtship displays.