Finches are often thought to be the key to Charles Darwin's theory on evolution. These birds were present on the Galapagos Islands when Darwin visited. They varied in size and (perhaps most memorably to grade school evolutionary biology enthusiasts and textbooks) beak shape--seemingly different species of finches appeared on the different islands. Often credited with the inspiration for Darwin's idea of descent with modification, finches are a famous example of Darwin's theories in action... But how much credit do they really deserve?