The Gragnol is a native of Bryyo. It is the underdeveloped version of a Gragnol Adult. As such, their body's are weak and vulnerable to weapon fire. They live in Gragnol Hives attached to walls and will emerge to defend them, should they sense a threat present.
 Logbook Entry
"Gragnols are vulnerable to most weapons, as they have not developed the durable exoskeleton found on adult members of the species. They often travel and attack in groups. If they sense a nearby threat to their hives, they will not hesitate to advance. Their offensive capabilities are underdeveloped, leaving the ability to fire energy pulses of Phazon energy their only form of attack."
The Gragnol appears in the following games: