I took the photo this morning, on a walk through the veld near my home. It is clearly a lair. My guess would be the common rain spider (the local tarantula). They are fairly harmless. Their bite is said to be about as bad as a bee sting. OBSERVATION: But watch out for the wasps that prey on them. If a wasp thinks you are after its prey, you could have something nastier than a tarantula bite. You may click on the photo to enlarge.