David Roberts

When you sling a saddle atop a llama's back, just after he's rolled in the dirt to scratch the unscratchable tickle of having lugged an ungrateful hiker's 90 pounds of impedimenta another eight miles along the trail, you're struck by how matted, coarse, and snarly the wool seems. But that's why it makes for versatile outdoor wear.

I knew that alpaca wool, with its cashmere-soft weave, had been transformed into cuddly knick-knacks ranging from pillows to teddy bears. But through selective breeding over the past 6,000 years, alpacas have so diverged from their llama cousins as to become quite different animals.