Glowbug

Wild

The Light Bug is believed to be a descendant of the Lampyridae insect family. Typically, an insect with its characteristics will flourish in areas with no known natural predators. However, I believe the Light Bug population is moderated by the amount of creatures that vie for its charged light source. Despite being the source of a prized resource, many tribes believe the Light Bug to be sacred and admire it for its illuminance and elegant patterns.

Domesticated

Domesticating a Light bug would be a complete waste of time. It is not known to have any useful utility or function. I imagine you could save on fuel by using them to light a settlement.