Different Deer Species

I know we have all seen deer many times, but how many times have you seen different species? I am not referring to the entire deer family in which there are over 40 species including moose and elks. Separating an elk or moose from the classic deer is pretty easy considering their large differences. Identifying different normal deers usually requires one or two simple things to look at. The easiest is their tale color. Some have different ears also. On my property here in WA state I always see black tailed deers. A while ago, however, my job had me in Montana where I was able to see and photo a white tailed deer. These two had different ear colors also.