Darwin's finches
species of finches Charles Darwin discovered on the Galapagos Islands. Darwin's voyage on HMS Beagle, and the finches in particular, are known to have influenced his thinking so that he would later produce a basic theory of evolution by natural selection. Darwin reasoned that there had to be a common ancestor. Later, much work was done by Peter and Rosemary Grant.
The birds are all about the same size (10–20 cm). They mainly differ in the form of the bill. The bill is adapted to the food they eat. The birds are all brownish or black. Their behaviour differs as they have different song melodies.
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- Genus Geospiza
- Large Cactus Finch (Geospiza conirostris)
- Sharp-beaked Ground Finch (Geospiza difficilis)
- Medium Ground Finch (Geospiza fortis)
- Small Ground Finch (Geospiza fuliginosa)
- Large Ground Finch (Geospiza magnirostris)
- Common Cactus Finch (Geospiza scandens)
- ..... (Geospiza parvula)
- Genus Camarhynchus
- Vegetarian Finch (Camarhynchus crassirostris syn. Platyspiza crassirostris)
- Large Tree Finch (Camarhynchus psittacula)
- Medium Tree Finch (Camarhynchus pauper)
- Small Tree Finch (Camarhynchus parvulus)
- Woodpecker Finch (Camarhynchus pallidus)
- Genus Certhidea
- Warbler Finch (Certhidea olivacea)
- Genus Pinaroloxias
- Cocos Island Finch (Pinaroloxias inornata)
Peter and Rosemary Grant
Peter and Rosemary Grant have studied these birds extensively and written a book on the subject called The Beak of the Finch
