Exploding Frogs in Germany

Via ProMED-mail: the BBC reports on mysterious exploding German frogs:

Thousands of the amphibians have died in recent days in a pond in Hamburg's Altona district, with their bodies swelling to bursting point.
The toads' entrails are propelled for up to a metre (3.2ft), in scenes that have been likened to science fiction.
Scientists are baffled. Possible explanations include a unknown virus or a fungus in the pond.