Among the most intriguing creatures of the Australian Outback are the cathedral termites, which build slender, 5.8-foot/1.8-m-high pillars clustered throughout the bare earth. These towers, often called "magnetic mounds," are always structured facing north-to-south, possibly to help the insects regulate the temperature inside them. Wichetty grubs, a plump white species found throughout the wilderness, are a staple food of the Aboriginal tribes. Interestingly, Australia is also home to about 10% of all the ants on the globe, which are found here in approximately 1,500 different species. The largest is the bulldog ant, which grows to more than 3 cm long.