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Elk - Wikipedia
Elk - New World Encyclopedia
加拿大馬鹿 - 维基百科,自由的百科全书
Elk | Description, Habitat, Reproduction, & Facts | Britannica
Elk Animal Facts - Cervus canadensis - A-Z Animals
ADW: Cervus elaphus: CLASSIFICATION
11 Different Types of Elk (American & Asian) - WildlifeBoss.com
Subspecies of Elk - Outdoors International
The Relationships and Classifications of Roosevelt Elk
BC Conservation Data Centre: Species Summary - Gov