From Anthony Forbes, Durban, South Africa
There is no evidence that an apparent reduction in great white sharks off the south coast of South Africa has resulted in a rise in seal numbers and greater predation of or competition with penguins (9 March, p 10).
The African penguin is in a well-documented catastrophic decline following decades of , both now fortunately no more. The biggest documented threat at this stage is , whose activities in areas around island breeding colonies were curtailed, but have now been restored following industry pressure.
