New animals in forest

I think that we can add three animals in three types of forest :

Elk

elk spawn in taïga. when a player is near an Elk, he attack them. if you beat the Elk, he drop Elk's leather. with 8 Elk's leather, you can craft a cape who allow knockback resistance.

Deer

Deer spawn in forest. he is a rare passive mob. He drop antlers. if you use replace sitcks by antlers in the craft of the bow, you can craft a anlter bow. he has a better durability and make more damage.

Roe

roe spawn in brich forest. he is a rare passif mob too. when he see a player, he run. if you kill it, you can get raw venison. if you cook them, you can get veninson. it is the better food of the game.