Pete Oxford / Common Cactus-Finch (Geospiza scandens) feeding on cactus, Galapagos Islands, Ecuador

Tui De Roy / Large Ground Finch (Geospiza magnirostris) feeding on a seed, Ecuador

D. Parer & E. Parer-Cook / Galapagos Land Iguana (Conolophus subcristatus) with a Small Ground-Finch (Geospiza fuliginosa) on its head removing parasites, Galapagos Islands, Ecuador

Tui De Roy / Wolf-Volcano giant tortoise (Chelonoidis nigra becki) portrait with ground finch (Geospiza sp. ) sitting on foot, Isabela Island, Galapagos. Did you know? Galapagos tortoises have a mutualistic relati...

Mark Moffett / Large Ground Finch (Geospiza magnirostris) endemic species, extra large bill for cracking large seeds, largest of Darwin's 13 Finches, Santiago Island, Galapagos Islands, Ecuador

Tui De Roy / Common Cactus-Finch (Geospiza scandens) feeding on Opuntia (Opuntia sp) cactus blossom, Academy Bay, Santa Cruz Island, Galapagos Islands, Ecuador

Tui De Roy / Common Cactus-Finch (Geospiza scandens) feeding on (Opuntia sp) Common Cactus Fruit, Santa Fe Island, Galapagos Islands, Ecuador

Tui De Roy / Darwin's Finch (Geospiza sp) picking ticks from Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Darwin's Finch (Geospiza sp) group picking ticks from Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Darwin's Finch (Geospiza sp) picking off ticks from Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Darwin's Finch (Geospiza sp) picking off ticks from Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) and Darwin's Finch (Geospiza sp), Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador