Technically, there is only one type of graboid, the large worm-like creature.  It starts out as an egg, which must be kept warm in order to hatch.  I grows to its full size of around 30 feet fairly quickly, but is pretty deadly even as a “baby” graboid.   After a time, and for reasons still a bit unclear, graboids then go through a transformation.  They metamorphose into much smaller shriekers (Tremors 2) that literally eat their way out of the parent worm, killing it.  These hermaphroditic critters procreate quite rapidly and can become a dangerous carnivorous herd.  But at some point, shriekers undergo a second metamorphosis, changing into assblasters (Tremors 3), a winged version capable of launching itself and gliding.  Each assblaster carries one egg and seeks out a appropriate spot to lay it, usually in or near naturally warm places like volcanic hot springs.  It is unclear how long the eggs then lay dormant before hatching.

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