I think horses are some of the coolest animals in the world
Horses are one of my favorite animals. They've evolved over the past 45 million years from having multiple toes to one hoof! 
Wow I have no idea!
horses, rhinoceroses and tapirs.
Hooves are generally cited as limb structures restricted to placental mammals, which unlike other mammal groups undergo prolonged pregnancies. However, the marsupial "Chaeropus" had hooves.
Description.
The hoof surrounds the distal end of the second phalanx, the distal phalanx, and the navicular bone. The hoof consists of the hoof wall, the bars of the hoof, the sole and frog and soft tissue shock absorption structures. The weight of the animal is normally borne by both the sole and
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Perissodactyls are said to have evolved from the Phenacodontidae, small, sheep-sized animals that were already showing signs of anatomical features that their descendants would inherit (the reduction of digit I and V for example). By the start of the Eocene, 55 million years ago (Mya), they had diversified and spread out to occupy several continents. Horses and tapirs both evolved in North America; rhinoceroses appear to have developed in Asia from tapir-like animals and then colonised the Americas during the middle Eocene (