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More than 1,000 toads have puffed up and exploded in a Hamburg pond in recent weeks, and German scientists still have no explanation for what's causing the combustion, an official said. Both the pond's water and body parts of the toads have been tested, but scientists have been unable to find a bacteria or virus that would cause the toads to swell up and pop, said Janne Kloepper, of the Hamburg-based Institute for Hygiene and the Environment. "It's absolutely strange," she said. "We have a really unique story here in Hamburg. This phenomenon really doesn't seem to have appeared anywhere before."

The toads at a pond in the upscale neighborhood of Altona have been blowing up since the beginning of the month, filling up like balloons until their stomachs suddenly burst. "It looks like a scene from a science-fiction movie," Werner Schmolnik, the head of a local environment group, told the Hamburger Abendblatt daily. "The bloated animals suffer for several minutes before they finally die."

Biologists have come up with several theories, but Kloepper said that most have been ruled out. The pond's water quality is no better or worse than other bodies of water in Hamburg, the toads did not appear to have a disease, and a laboratory in Berlin has ruled out the possibility that it is a fungus that made its way from South America, she said.

She said that tests will continue. In the meantime, city residents have been warned to stay away from the pond.

BERLIN Apr 28, 2005 — Why are toads puffing up and spontaneously exploding in northern Europe? It began in a posh German neighborhood and has spread across the border into Denmark. It's left onlookers baffled, but one German scientist studying the splattered amphibian remains now has a theory: Hungry crows may be pecking out their livers.

"The crows are clever," said Frank Mutschmann, a Berlin veterinarian who collected and tested specimens at the Hamburg pond. "They learn quickly from watching other crows how to get the livers." [...] Based on the wounds, Mutschmann said, it appears that a bird pecks into the toad with its beak between the amphibian's chest and abdominal cavity, and the toad puffs itself up as a natural defense mechanism.

But, because the liver is missing and there's a hole in the toad's body, the blood vessels and lungs burst and the other organs ooze out, he said. As gruesome as it sounds, it isn't actually that unusual, he said. "It's not unique; it's in a city area, and that makes it spectacular," Mutschmann said. "Of course, it's something very dramatic."...