Killer whales may be behind the disappearance of great white sharks from South Africa’s coastline, a government report suggests. Researchers were commissioned to investigate why there has been a steep decline in sightings of sharks since 2017. The researchers said they “found some evidence for a causative link between the appearances of a pod of killer whales that had specialised on preying on white sharks”. They noted that a pair of killer whales was first sighted in the area in 2015. The decline in the sharks had originally been blamed on illegal hunting and overfishing.