A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community.
They're primarily active during the cool night, lounging by day in burrow systems where they take refuge from hot and cold ... the desert kit fox as threatened under the California Endangered Species ...
The Twentynine Palms Marine Corps base houses vulnerable young desert tortoises until they're hardy enough to withstand ...
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