The Deer is a wild Animal that does not attack and runs when startled
It shows up as yellow indicator on the minimap.
Currently the only two ways to kill deer are with an undetected sneak attack or a ranged weapon.
2-3 deer spawn in the home area when a player starts the game. For these deer, even if they are chased out of the map, they will still be in the area when a player exits/reenters the area.
As of Version 1.6, deer have been given a more "natural" AI. They will occasionally move around the map while grazing the grass. The deer will run away if it sees the player, sneaking or not.