Once upon a time a lively debate (elsewhere) ensued. Some people said that the reason why goats are so excellent cliff wall climbers is because they have Velcro in their hooves (and that's where we harvest it).
But I have a much, much better theory!
All goats have suckered tentacles on their sides (can be hidden under fur), and whenever they want to climb, they just sprout out the tentacles from the wall side, and cling on.
Here we see a presentation of what happens when their secret is discovered.
Warning: do not discover the secrets of goats. Goats do not like their secrets discovered.
Since some people suggested they might want this startling discovery printed on a mousepad or mug (because some mental images need to be inflicted on others too), hereby I grant a permission to modify and print this picture (i.e. stick it to mugs, mousepads, calendars, buttplugs whatever), including all commercial use, as long as my watermark is kept in place. If they don't believe you in print shop, show them this. Go nuts.