Ponds, Beaver Ponds, Arctic & Antarctic Ponds, and Walden Pond

In Death Valley, the wild burros, dependents of donkeys released by miners in 1890s, dig wells of about 5 feet looking for water.

When they find water, the wells create a habitat for amphibians, insects and even trees.

Completely unrelated side note: the profits from Dark Side of the Moon helped finance Holy Grail.