Scientists have long believed that the 14 species of finches on the galapagos islands evolved from a single species of finch that migrated to the islands 1-5 million years ago. recent dna analyses support the conclusion that all of the galapagos finches evolved from the warbler finch. different species live on different islands. for example, the medium ground finch and the cactus finch live on one island. the large cactus finch occupies another island. one of the major changes in the finches is in their beak sizes and shapes. how did the different beak types first arise in the galapagos finches?