Zorse
Even though they might look picturesque, the Zorse, or otherwise known as a zonkey or zebroid is the offspring of a zebra and a horse or a donkey.
This crazy-looking horse will make you do a double-take and exclaim why does that horse have stripes. The source is a result of the crossbreeding of a male zebra and a female horse.
It turns out that the zebra part gives the horse high resistance to certain pests and diseases. They exist to this day but very rarely due to the fact that they are infertile or sterile.