Minecraft wiki entry for Development_versions, associated text: Ridable by right-clicking them, move with usual movement keys, maximum speed, and jump height differ between horses.
Have various amounts of maximum health, use wheat and carrots to heal them.
Drop leather when killed.
Can be bred using wheat – baby horses can be grown using apples, golden apples, wheat, and hay bales.
Players can make them jump by pressing and holding the space bar.
They naturally step up over 1 block, which enables you to walk up hills.
They can also use ladders, when steered towards them.
Creation assisted by DrZhark (Creator of the Mo' Creatures mod).