Ah, but the eggs in Tremors 4 were laid by AssBlasters, not Graboids. You have to watch ALL the movies to learn the whole complicated life cycle. Most of it happens via metamorphosis – like when a caterpillar turns into a butterfly. Graboids metamorphose into Shriekers. Shriekers make more Shriekers hermaphroditically (there are egg-like sacs inside Shriekers, but they don’t lay them). Later, Shriekers metamorphose into AssBlasters. It is only AssBlasters that lay eggs — one egg each. Those eggs, if kept warm enough, hatch into baby Graboids, and the process starts over. We just didn’t see the AssBlaster in Tremors 4. In fact, we’re not sure how long AssBlaster eggs can lay dormant. It may be a really long time.
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