Spawning from large, organic globules (Giggi Sacs) in dark caves, they exhibit unique behavior.
When the torch is drawn, they retreat in fear; however, when the torch is extinguished, they slowly follow hunters and latch onto them, constantly draining "blood", doing damage similar to the poison effect, and must be "shaken" off. If a Giggi sucks a significant amount of health off the victim, it will be able to do a poison spit.
Wyvern larvae. Reasonably fecund, they can survive in any dark environment. Giggi are sensitive to light and heat, and so avoid torches. They are also known to leech from other animals, converting it into toxins.
Remarkably fecund wyvern larvae that can flourish in any dark environment. They survive by leeching onto other animals, sucking their blood, and then converting it to toxins. Giggi victims are advised to shake them off by rolling vigorously on the ground.
As a Giggi sucks the hunter's blood, it starts to increase in size, but will only reach a certain body mass.
Giggi can be found in every environment in Monster Hunter 3, but its adult form, Gigginox, can only be found in the Tundra.