The graboid life cycle is quite unusual. Graboids (the large worm form in Tremors 1) grow from large eggs. They fairly rapidly achieve full size and from that standpoint might be considered the adults of the species. But in fact they are technically more akin to larvae in other creatures.  After a time, and it’s not clear what triggers this event, graboids slow and die and burst open, being eaten from within by several shriekers, much smaller bipedal creatures whose only purpose is to eat as much as possible and multiply as fast as possible (through non-sexual spontaneous hermaphroditic reproduction).  They were featured in Tremors 2.  Any shrieker that survives long enough eventually forms a cocoon from which emerges a winged animal dubbed an Ass Blaster by Jodi Chang of Perfection (Tremors 3). ABs can glide long distances after launching themselves into the air via a blast of reactive chemicals fired from their hind quarters, hence the graphic name. They are “born” with a graboid egg already inside, and as quickly as possible they seek out appropriate places to lay it, primarily areas with  geothermic activity (like hot springs). When graboids hatch from the eggs, the cycle starts anew.

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