Elk and Deer mobs

Elk and Deer would be a fun mob to add to show off mob-biome variants. Could be possible to have Reindeer as a tamed version, larger untamable moose mobs showing up occasionally in termperate-cold biomes and herds of smaller deer showing up all over, potentially with wandering groups of nomadic villagers on horses to teach players about riding animals. Id image these would drop venison and leather when killed, and drip antlers occasionally while wandering. IRL antler is very useful, although i am unsure what its use in game would be. Such an inclusion would also be a good time to add an additional "Herding" behavior for dogs.