They are natural, rather than being the landing site of an alien ship, or a buried giant turtle (although arguably the latter phenomenon is natural, just weird. But so are these.) Here's what pingoes are (and here), and here's what they look like.
Solvitur ambulando! Note the thick brow-ridge, the idiotic grin, and the death-grip on the beverage. You can email this handsome devil at email@example.com.
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Rattlesnake Encounter Map
Have you run across one of our scaly friends on a trail in California? Take 5 seconds and add it to this map so we can see where interactions are more likely to take place, and make life safer for trail users.