Save The Graboids Tremors Sweatshirt Size:Medium Tribbles first appeared in the

Tribbles first appeared in the Star Trek episode titled "The Trouble With Tribbles"

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Save The Graboids Tremors Sweatshirt Size:Medium Tribbles first appeared in theThis Tremors sweatshirt shows a terrifying graboid in a campaign image that reads Protect Local Wildlife Save The Graboids. It seems that considering the information presented in the Tremors movies, a graboid's entire life cycle can take place in about 9 months, however due to the eggs ability to hibernate for extended periods of time this is likely the reason that the creatures were virtually unknown up until the late 20th century. A graboid's life