Bullbo

Bullbos are the boar-like creatures in Twilight Princess, and Spirit Tracks. They are frequently used as mounts by Bulblins.

Twilight Princess
The Bullbos are very tough and can only be killed by running them off a cliff or repeatedly attacking them with a sword. An easy way to stop them while riding Epona is to shoot them with a bomb arrow which will make quick work of them. They are nearly impossible to stop once provoked. A rider must either wait for them to calm down on their own, or guide them into a solid wall.

Bullbos are usually ridden by Bulblins. There are two Bulblins to each Bullbo, a rider and an archer. If the rider is knocked off the Bullbo, the Bullbo will keep running out of control until it crashes into a wall or runs off a cliff.

After knocking the Bulblins down, Bullbos can be ridden in a similar way to Epona. However, the brutish creatures are far less intelligent than Link's horse (they are one of the few animals that do not speak to Wolf Link when prompted). They don't seem to have the sense to stop before running into solid objects or even right off of a cliff. Link can't quick-dismount them the same way he can Epona, and cannot use items while riding them. When spurred or attacked with a weapon, Bullbos are harder to control but they can ram wooden structures to smash through them. They will only stop when they feel like stopping, unless they are guided into a solid wall. This will stun the Bullbo for a while and throw off its rider.

Bullbos are also used for food, as seen in the Gerudo Desert. A dead, hairless Bullbo is seen over a fire tied to a spit. If Link slashes the roast Bullbo, recovery hearts will appear, and repeated attacks will slash it open to reveal a Piece of Heart.

Spirit Tracks
Bullbos make a similar appearance in Spirit Tracks. They can be found following and ramming into Link's Spirit Train in areas of the Forest Realm and Snow Realm, some of which are once again mounted on by Bulblins who fire bomb arrows. Their appearance resembles less of a boar and now more of a wild hog.