Mountain goats are not actually goats!

Yes, they do fashion the woolly coats, cloven feet, and horns but not the same kind as “true goats.” The high altitudes that they reside in call for fur that is thicker and shaggier than that of a domesticated farm goat.

Their hooves are specially built for climbing and descending those ungodly mountain slopes; a rubbery padding covers the bottom of their hooves. And to fend off all those predators, their horns are long and pointy.

Biologically, these goats actually are actually antelopes and sometimes referred to as goat-antelopes. Mountain goats are not goats in the same way that koala bears are not bears and Komodo dragons are not dragons.

(Source)