Thorold's deer, Cervus albirostris "Cervus_albirostris_2_-_Syracuse_Zoo" by Dpape via Flickr, Creative Commons Attribution.	Elk, wapiti, Cervus canadensis "20100916_0881" by Dw_ross via Flickr, Creative Commons Attribution.
Red Deer, Cervus elaphus "Red Deer" by Dave Hamster via Flickr, Creative Commons Attribution.	Sika Deer, Cervus nippon "Sika Deer" by Just chaos via Flickr, Creative Commons Attribution.

Taxonomy:

Thorold's deer, Cervus albirostris

Elk, wapiti, Cervus canadensis

Cervus canadensis alashanicus (Add)
Cervus canadensis canadensis (Add)
Kansu red deer, Cervus canadensis kansuensis (Add)
Sichuan deer, Cervus canadensis macneilli (Add)
Cervus canadensis manitobensis (Add)
Cervus canadensis merriami (Add)
Cervus canadensis nannodes (Add)
Cervus canadensis nelsoni (Add)
Cervus canadensis roosevelti (Add)
Cervus canadensis sibiricus (Add)
Cervus canadensis songaricus (Add)
Cervus canadensis wallichi (Add)
Manchurian wapiti, Cervus canadensis xanthopygus (Add)

Red Deer, Cervus elaphus

Cervus elaphus bactrianus (Add)
Red deer, Cervus elaphus corsicanus (Add)
Cervus elaphus elaphus (Add)
Cervus elaphus hanglu (Add)
Cervus elaphus hippelaphus (Add)
Caspian red deer, Cervus elaphus maral (Add)
Cervus elaphus scoticus (Add)
Yarkand deer, Cervus elaphus yarkandensis (Add)

Sika Deer, Cervus nippon