Appendix:VS index

Ratites

 * 1) AppendixCommon Ostrich vs. Somali Ostrich

Waterfowl

 * 1) Appendix:Wood Duck vs. Mandarin Duck

Gamebirds

 * 1) Appendix:Gunnison Grouse vs. Sage Grouse

Penguins

 * 1) Appendix:King Penguin vs. Emperor Penguin

Pelicans and allies

 * 1) Appendix:Peruvian Pelican vs. Brown Pelican

Eagles, Osprey, Hawks, Vultures and Kites

 * 1) Appendix:Mississippi Kite vs. Plumbeous Kite
 * 2) Appendix:Cooper's Hawk vs. Sharp-shinned Hawk
 * 3) Appendix:Osprey vs. Bald Eagle
 * 4) Appendix:White-tailed Eagle vs. Bald Eagle
 * 5) Appendix:Cape Vulture vs. White-backed Vulture

Cranes, Rails, Bustards and allies

 * 1) Appendix:Sandhill Crane vs. Whooping Crane

Sandpipers, Gulls, Auks, Plovers and allies

 * 1) Appendix:Western Gull vs. Herring Gull

Sandgrouse, Doves and Pigeons

 * 1) Appendix:Eurasian Collared Dove vs. Mourning Dove
 * 2) Appendix:Mourning Dove vs. Zenaida Dove
 * 3) Appendix:Zenaida Dove vs. White-winged Dove
 * 4) Appendix:White-winged Dove vs. Mourning Dove
 * 5) Appendix:Stock Dove vs. Rock Pigeon

Parrots

 * 1) Appendix:Blue-throated Macaw vs. Blue-and-yellow Macaw

Cuckoos and Turacos

 * 1) Appendix:Yellow-billed Cuckoo vs. Black-billed Cuckoo
 * 2) Appendix:Common Cuckoo vs. Oriental Cuckoo
 * 3) Appendix:Mangrove Cuckoo vs. Black-billed Cuckoo
 * 4) Appendix:Mangrove Cuckoo vs. Yellow-billed Cuckoo
 * 5) Appendix:Smooth-billed Ani vs. Grove-billed Ani

Hummingbirds
This section is kept separate from the swifts because of the sheer number of species.

Toucans, Woodpeckers and allies

 * 1) Appendix:Downy Woodpecker vs. Hairy Woodpecker

Suboscines

 * 1) Differentiating the Empidonax flycatchers