A pond is surrounded by the bodies of a thousand dead toads, all of which appear to have died in a particularly gruesome way: they had exploded, in some cases with such force that their internal organs were thrown some distance away.
The water quality of the pond was fine. No toxins or viruses were found to explain the mystery. But dissections of the toads found that they were all missing…
That, plus one other clue, told scientists what had happened to the toads.
I do love a good whodunit.
(Hat top to Alma.)