Finding small, moving shapes in your toilet after a heavy rain can be startling, but the explanation is usually far less alarming than it seems. In many cases, these “mystery invaders” turn out to be tadpoles—the early life stage of frogs that have ended up in an unexpected place.
After rainfall, frogs actively search for still water to lay their eggs. If there’s access—like an open vent, uncovered drain, or even a bathroom window left ajar—they may find their way into spaces we don’t typically think of as part of nature. Once the eggs hatch, the tiny tadpoles can appear in the water, creating a surprising (and admittedly unsettling) sight.