What many don't realize about WBCs is that they have the ability to become a nuisance in urban or peri-urban areas.
About 8 years a group of them decided to stop roosting on the rocks on the coast in front of our house at Schoenies and started spending their nights in a few large Norfolk Pines in our garden. We have been loath to get rid of the Norfolk Pines because they are the roosts for Crested Guinea Fowl and for the past 10 years we have had a family of Hadedah Ibises produce a chick each summer as well as numerous Cape Weaver nesting (along with the attendant Deideriks and Klaas's Cuckoos) but the mess and destruction caused by the WBCs made us think seriously about chopping the trees down.
Our garden used to get covered in fresh guano produced by up to 50 WBCs every night as well as the occasional half eaten fish and squid. In fact, the Pied Crows used to harass the WBCs as they came into roost to get them to regurgitate their recently eaten catch.
It has taken about a year now but we have hopefully persuaded them to move back onto the rocks again. The methods we used were neither pleasant nor do they evoke any pride in me but they were at least non-destructive.
Essentially what we did was wait for them to settle at night and them shoot pebbles at them with a catapult as well as firing off lady crackers.
Every now and then we still get one or two who come to roost and then we have to get the catty and crackers out again.
Amazingly, the weavers and the hadedahs have seemed to understand that they were not our target and haven't appeared disturbed by the flying stones and bangs going off.