White-tailed deer (Odocoileus virginianus)

I don't know where you're from, but around the midwest, the whitetail is the center of a near-religion (... or near-cult?) The week before Thanksgiving, about every other person outside the urban city limits is going to be wearing blaze orange. For those who don't know this means, state hunting regulations require that hunters wear a certain percentage of blaze orange while deer hunting.

Why blaze orange? Deer are somewhat color blind. Researchers have found that deer's color vision in the longer wavelengths of color (yellow, orange red) is weak and in the shorter wavelengths (blue, purple) it is very strong. So blaze orange is likely seen as dark yellow, where greens would be perceived as lighter yellow. So blaze orange, while it stands out for humans, blends into the forest background for deer.

The whitetail itself changes colors over the year, being a reddish brown in the spring and moving toward a grey brown throughout winter.

White tailed deer survive on grasses, roots, corn, roots, shoots, leaves, acorns and fruits. They are ruminants, which means they have four chambered stomachs, each chamber specialized for a certain kind of food.

Male deer, older than one year old have antlers, which they shed once all females have been bred, usually around late winter. The antlers are used as weapons in dominance battles between males and marking territory (by rubbing bark off trees).

From Wikipedia:

White tailed deer are the state animals of Arkansas, Illinois, Mississippi, New Hampshire, Ohio, Pennsylvania, Michigan, South Carolina, and Wisconsin [which gives you some indication of the popularity of hunting in these states].

White-tailed deer were introduced to Finland in 1935 . The introduction was successful, and the deer have recently begun spreading through northern Scandinavia and southern Karelia, competing with, and sometimes displacing, native fauna. The current population of some 30,000 deer originate from four animals provided by Finnish Americans from Minnesota.