The secret to their ability to climb lies in the shape of their hooves. The keratin reinforced hoof wall adds strength, while the soft textured sole provides traction and grip. It's also capable of deforming inwards to counter irregularities in the terrain. Their toes are capable of operating independently giving them more of a "grip".

These hooves evolved to allow the goats to climb rocky, mountainous areas - but they've shifted ecosystems to the trees!
via webecoist.momtastic.com
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