A Deer is a shy, passive mob that spawns in a variety of biomes.
As of DEV v8.0.0, Deers will now jump when fleeing from mobs or the player.
Deers drop Fur when killed. In older versions, they dropped Raw Porkchops.
There are three variants: A male, a female and a fawn. If the Deer is a male, it will have antlers, be much larger than the others and look more upright. If the Deer is a female, it will have no antlers and look outward more. Fawns are much smaller and are more spotted than the female Deer.
A Deer will run away from anything bigger than a Chicken. Being a passive mob, they are peaceful creatures, and will never attack. However, when running, they can be very fast sprinters, as well as high jumpers, and will jump around wildly when trying to escape. Deer can jump over wooden fences. This can make them difficult to attack or trap.
Like many untamable mobs in Mo' Creatures, a Deer will despawn after some time, making any efforts other than killing them useless. A Deer will occasionally drop Fur when killed, which can be crafted into Armor.
Deer are shy, so the best way to kill them is to shoot them from afar with a Bow. If you lack a Bow, take a Sword and run up to them. They are usually found in groups of three, so it is safe to charge. If you miss one, there are two more. They gather under trees for some reason. For Arrows, carry eight or so, just in case you miss.
Like most passive mobs, Deer can be sent into love mode when fed Wheat. Though they can be sent into love mode, Deer cannot actually breed. Once given Wheat, a Deer will often forever remain in Love Mode. A Deer will be forced to come out of Love Mode if it is attacked.