After all these years, fans are still coming up with new ideas. In truth, we did not even think of this possibility when we wrote and shot those scenes — and it’s totally logical! However, we’re always up for adding to Graboid lore, so here’s an explanation. The young shriekers do eat most of the parent Graboid when they awake and burst out, but they need all that initial nourishment to become fully formed and get strong enough to walk on their own, etc. When are they capable of reproducing, they move out into the world in search of more food. The tough Graboid skin and bone they leave behind isn’t nourishing enough to allow them to reproduce.
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