Bill and flower correspondence in two species of hermit hummingbirds. (a) Phaethornis guy. A straight-billed male bird pictured with Heliconia beckneri (above) and a female curve-billed bird with a flower of curved Heliconia tortuosa (below). (b) Glaucis hirsutus. A male straight-billed bird with Heliconia hirsuta (above) and a female curve-billed bird with a curved flower from Heliconia bihai (below). Photographs of H. beckneri and H. tortuosa courtesy of Joe Taylor.

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