THE 14 SPECIES of Darwin'r finches are arranged at the left to suggest the evolutionari tree of their development. Grayish brown to black all belong to the subfamily Geospizinae divided broadly into ground fincher (Geospiza) closest ln rhe primirive form, and tree finches (mainly Cnmarltynch-rFj-, Gliiclr evolved llter. ()f the tree slreciee, I igi wooJnecker-llke fincb