Robben Island museum should call in Wallace and Gromit.
While the island does not have any of the Were-Rabbits - which the clay duo fought off so successfully that they won an Oscar - it appears the island may be harbouring something even scarier: hundreds of flesh-eating rabbits.
Although there is no hard evidence, the SPCA believes the island may be home to hundreds and hundreds of carnivorous rabbits that are stalking nesting birds, ripping them to shreds and eating them.
Allan Perrins, of the Cape of Good Hope SPCA, believes it is these rabbits, and not cats, that are responsible for the deaths in one of the country's most important bird-breeding colonies.
He concedes that flesh-eating bunnies is a "radical theory", but says SPCA staff have seen far more rabbits than cats on the island and that they move around "like packs of rats".
The SPCA has been on the island trapping wild cats in cages to save them from being shot as part of the island's feral cat eradication programme, which has been stipulated by the international body managing World Heritage Sites. At first the cats were shot, but the authorities have allowed the SPCA to come to catch them. So far only eight have been caught.
The rabbits were released onto the island by European sailors in the 16th, 17th and 18th centuries, a practice apparently common in the early days of long sea voyages where sailors sought to ensure a secure supply of meat for emergencies.
Andries Venter of the SPCA said on Monday: "I know it's a wild theory, but the island is overpopulated with rabbits. As an inspector I've seen rabbits in people's backyards that have not been given enough food and they have started eating each other.
"We haven't seen any hard evidence, but we're having a meeting tomorrow to discuss the possibility."
Les Underhill, ornithologist with UCT's Avian Demography Unit, said on Monday that when he heard the carnivorous rabbit theory, he "almost fell about laughing".
"I imagine a hopping rabbit would have something of a problem stalking a bird," he said.
He said although no one on Robben Island had caught a cat in the act of catching a bird, there were "tell-tale signs".
"Cats rip birds to pieces and there is very little left, which is how we've been finding the remains of birds on the island," Underhill said.
"In the 2004/05 breeding season of the oyster catchers, I would check the nests at dusk and by dawn the next day the eggs were gone. It was definitely a nocturnal predator.
"Rabbits are a problem, too, but to the vegetation, not the birds."