Deer mob for forest biomes that drop antlers for a double jump potion

The forest biomes in Minecraft always felt a little lacking in terms of the biodiversity. One addition to help would be the deer! Deer are on most of the continents in the world so they would be fitting in just about any forest biomes. Deer would be a passive mob but would have a chance to drop raw venison, antlers, and leather if killed. 

The antlers the deer drop could be used to create a new potion that would allow the player to double jump without touching another block. The deer mob would help the forests come alive while also serving a gameplay purpose!