A 13-year-old Indian boy has begun producing winged beetles in his urine after hatching the eggs in his body, a senior medical official said Monday.

The beetles -- more than half a centimeter in length -- belong to the Staphylinidae rove beetle family of insects. Most types are predators but some feed on fungi, algae and decaying plant matter.

An expert in urology, Doctor N. Subramanian, said that in theory it was possible for insects to hatch in the body and come out in urine but said he had not heard of such a case.