TWO 19th-century rhino horns stolen from a South African museum could be deadly if sold as a popular aphrodisiac because they are drenched in poison, a museum official said Monday.

The "priceless" horns were snatched from a display at the historic mammal gallery in Cape Town on Saturday evening, said Jatti Bredekamp, chief executive of Iziko Museums.

"Unknowingly, the thieves have exposed themselves to more than the danger of arrest and prosecution," Bredekamp said in a statement.

"Before the mid-20th century, taxidermy mounts were prepared by being soaked in arsenic and preserved from insect infestation through regular applications of DDT, both highly toxic poisons that retain their toxicity over time," he said.

Bredekamp said the horns were deliberately targeted in a carefully planned robbery, and might be destined for Asia, where ground rhino horns are a prized aphrodisiac.

"This could have unforeseen consequences," he said.

Rhino populations have fallen dramatically over the last few decades as poaching decimated the animals across Africa. (SD-Agencies)