Assertion: gila monster's tail | /r/PartOf | only 20% of its entire length
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Source sentences:
text: The Gila monster is the largest lizard in the United States; large adults measure up to 51-56 cm (20-22 in) in length, with the tail making up only 20% of its entire length; a weight averaging between 350-700 g (0.77-1.54 lb).