Charles Darwin concluded that many species of finches found on the Galapagos Islands

During his journey Darwin went to Galapagos Islands. He observed vast diversity in some small black birds later came to be known as Darwin's finches. From the original seed-eating features (in the South American mainland), many other forms with altered beaks arose, enabling them to become insectivorous and vegetarian finches (observed in different islands). They exhibit adaptive radiation and divergent evolution (not convergent).