10% in ten years or three generations, or with a specified population structure). Darwin's Finches. Using this type of peak, the sharp beaked finch can reach leaves, flowers, cactus pulp and insects. Sharp-beaked Ground-Finch Geospiza difficilis. Translate texts with the world's best machine translation technology, developed by the creators of Linguee. Using microsatellite DNA variation, morphological measurements and sonagrams made from tape-recordings in the field, we examine the allopatric differentiation of six populations of the sharp-beaked ground finch, Geospiza difficilis, in the Galapagos archipelago.We ask how and why the populations became differentiated, and consider what the differences imply about speciation. It is a subspecies of the Sharp-beaked Ground Finch (Geospiza difficilis), the only significant difference being its dietary preference. Does not qualify for a more at risk category. The first four shots on this page were taken on Tower Island in August, 2010, with a Canon EOS 1D Mark IV and a Sigma 50-500mm lens. The sharp-beaked ground finch (Geospiza difficilis) is a species of bird in the Darwin's finch group of the tanager family Thraupidae. The following other wikis use this file: Usage on ceb.wikipedia.org Geospiza difficilis; Usage on fa.wikipedia.org The Sharp-beaked Ground Finch (Geospiza difficilis) is a species of bird in the Darwin's finch group of the tanager family Thraupidae. Open menu. The Sharp-Billed Ground Finch evolved from a single Ground Finch ancestor from the mainland that spread out into 6 different species. Historically the species also occurred on Isabela, Floreana, San Cristobal and Santa Cruz islands, but has become extinct on all of these prior to 1939, most recently on Santa Cruz (Wiedenfeld 2006). In each of the different islands,, each subspecies has adapted to fit the environment. Avibase taxonomic concepts (current): Sharp-beaked Ground-Finch [difficilis or debilirostris] ( Geospiza difficilis) Avibase taxonomic concepts v. 05 (Jan 2017): Sharp-beaked Ground-Finch [difficilis or debilirostris] ( Geospiza difficilis [difficilis or debilirostris]) Avibase taxonomic concepts v. … As you might have guessed by the name, this bird feeds on the blood of other birds. This particular finch has a sharp bill, as can be confirmed by the named; the bill is long and pointed. Medium Ground-Finch has thicker, less pointed bill. Their bills vary greatly in size and shape (a fact which was instrumental in inspiring Charles Darwin's thinking in relation to the theory of evolution - and hence the name given to this fascinating group of species). 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