Assertion: desert tortoise's burrow | /r/HasProperty | underground
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Source sentences:
text: Insects, other invertebrates, rodents, toads, desert tortoises and kit foxes use underground burrows to shelter from surface temperatures that can reach 71 degrees Celsius (160 degrees Fahrenheit).
text: The desert tortoise spends upward of 98 percent of its time in its underground burrow, making it one of the most elusive creatures of the desert.
text: During a normal year of temperatures, it will spend from November to February in a torpid, or hibernation, state while in its underground burrow.