"The elk or wapiti (Cervus canadensis) is one of the largest species of the Cervidae or deer family in the world..."
http://en.wikipedia.org/wiki/Elk
"The moose (North America) or Eurasian elk (Europe), Alces alces, is the largest extant species in the deer family..."
http://en.wikipedia.org/wiki/Moose
"Deer (singular and plural) are the ruminant mammals forming the family Cervidae. Species in the family include white-tailed deer, mule deer such as black-tailed deer, elk, moose, red deer, reindeer (caribou), fallow deer, roe deer, pudú and chital."
http://en.wikipedia.org/wiki/Deer
http://en.wikipedia.org/wiki/Elk
"The moose (North America) or Eurasian elk (Europe), Alces alces, is the largest extant species in the deer family..."
http://en.wikipedia.org/wiki/Moose
"Deer (singular and plural) are the ruminant mammals forming the family Cervidae. Species in the family include white-tailed deer, mule deer such as black-tailed deer, elk, moose, red deer, reindeer (caribou), fallow deer, roe deer, pudú and chital."
http://en.wikipedia.org/wiki/Deer