Check out these goose species images:
Geese Walking on Ice, Kew Gardens, London.

Image by Jim Linwood
The Bar-headed Goose (rear) is a very striking species. Both sexes share the twin-barring on the head. The rest of the head is white with a streak running down the sides of the neck. The back of the neck is dark gray to black, rest of the body gray overall. To insure you have a pair, you may need to vent sex. Immature geese are somewhat paler and lack the bars on the head.
The Emperor Goose (Chen canagica) (front left) is a species of goose. It breeds around the Bering Sea, mostly in Alaska, USA, but also in Kamchatka, Russia. It is migratory, wintering mainly in the Aleutian Islands.
The Superior White-fronted Goose (Anser albifrons) (front right) is a goose species closely related to the smaller Lesser White-fronted Goose (A. erythropus).
Recommended Reading
- ducks
- Cackling Goose (Branta hutchinsii) cackling-goose
- Greater White Fronted Geese at Barnes Wetland Centre, London.
- HAWAIIAN GEESE “NENE” 30″ X 15″ – ENDANGERED SPECIES Reviews