Deer

Deers are wild animals, which you can find in various forests.

Behavior
The deer will run as soon as it sees you or as soon as you see it.

Runs faster than players. You may have trouble keeping up with one in an open field with no obstacles.

Is quite stupid and often gets stuck on hills and mountains. Or even hits trees and stops moving at all.

Loot
Higher quality pelts and bones, but common meat and awful/common bones.

Gives three pieces of loot altogether.

With a melee weapon
Spot one and start running after it. It's bound to get stuck sooner or later.

If possible, chase it into a wooded area. This should give you an advantage, as animals aren't quite as good as players at cutting corners around obstacles.

With a bow or a ranged weapon
Shot it as soon as you spot it. May your aim be true and your arrows sharp.

You better be good with that bow, that thing runs fast.

With traps
No idea. ~JakobSirk (Help.)