Savannah mob's: Zebra, Warthog and Gazelle

The Savannah biome is one of several biomes that DESPERATELY needs an update with how starved it is, I'm not sure when we will get the Baobab Tree's, Ostriches and Termites added.

However I think adding in mob's like the Zebra and Warthog (as Savannah exclusive variants of the pig and horse) would also help to make the biome more alive, as for Gazelle's, it would be cool to have some kind of "deer" in this game and the Gazelle would be another Savannah mob.

Not quite sure on what drops a Gazelle should have but one idea I had in mind is a rare chance to obtain their horns that could be used to craft a spear-like weapon for players (crafting i could see being 1 Gazelle horn, 1 copper ingot, 1 stick and 2 string in a plus shape).