A Picture is Worth a Thousand Words

The old joke is that orcs of Moria, vile and treacherous as they may be one-on-one, won't come near you while riding the back of a terrifying, thundering, bleating Yak of Doom!

But all that's a bit wordy to explain, and any Moria adventurer is likely get the message by looking at the picture. Or so Napoleon once claimed.