The ones at lodges are natural and fed by rains and shrink during the year. You can see the one at ours has shrunk a lot. however, I have a suspicion that they are supplemented by additional water by the lodges one way or another to keep them up. There are other waterholes around which are artificial and put there due to the restocking of this park and the fact that it is naturally so arid.
Everything we see occurs naturally here but it was restocked about 20 to 30 years ago and because of the water now maintains a higher animal load.
There is a major reservoir not far from where we are actually is the water supply for Gaborone, the capital of Botswana about 30 km away.
The giraffes were restocked from several sources and several species so what we have now are interbred hybrids.
