Finch specimens at the Charles Darwin Research Station, Puerto Ayora, Santa Cruz Island, Galapagos Islands, L to R Top: Large Ground Finch (Geospiza magnirostris), Woodpecker Finch (Cactospiza pallidus). L to R Center: Cactus Ground Finch (Geospiza scandens), Medium Ground Finch (Geospiza fortis). L to R Bottom: Warbler Finch (Certhidea olivacea), Small Tree Finch (Camarhynchus parvuls)