FireFlies are a collectible item in Star Fox Adventures. They can be used to light dark places where Fox McCloud can't normally see a thing. They can only be collected with a FireFly Lantern, which they are stored in. They look like green shining light orbs, which float up and down while following Fox after he uses one. They can often be found in caves, but can also be bought in ThornTail Store. Fox can carry a maximum of 31 at a time.
"This is a FireFly. It will be stored inside the FireFly Lantern. Let one out when you need to see in the dark."
- Fox can actually buy FireFlies even if without the FireFly Lantern. But since has nothing to store them in, this is an effective method of wasting Scarabs.