Variation among New & Old World Deer
The typical deer
of the Old World is the Red Deer (left); a similar form,
the Wapiti or American Elk (right) occurs in
North America. Early explorers recognized that the forms were
sufficiently similar that both are classified as Cervus
elaphus, but that there were also clear differences that
allow them to be recognized as distinct subspecies. Other
examples included Moose (Alces)
and Old Word Reindeer vs New World Caribou (both Rangifer
tarandus). Differences between the continental forms are
borne out by genetic studies.