Instead, the biggest sharks identify a location from which to strike, and then search the surrounding killing zone for their next victim.

BBC: Earth News - Great whites 'plan' seal attacks

By tweaking the design of a cull - expanding the central killing zone, and choosing sites carefully to take advantage of hard boundaries like rivers and motorways - Defra's chief veterinary officer Nigel Gibbens argues it should be possible to maximise the positive impact on bovine TB infection rates in cattle.

BBC: Badgers back in the firing line