Diego looked down at the black stick, noting for future reference that it was called a 'flashlight.' A black stick that... what, produced light?

A mystery for later. "I know what an opposable thumb is," he replied irritably, still looking at the stick. Here, at last, was the secret to why humans, as defenseless as they were, still managed to wipe out half his old pack. The secret to being able to hold round things. Still somewhat skeptical, Diego kept his balance with his right... hand, and lifted the left one to take the stick. He slowly curled the five fingers around it, gently at first, then more firmly as he got used to the strange sensation.

So this was what it felt like.