Arvoreznha, Brazil — Meet the admirable red-belly toad — a tiny amphibian found nowhere else on Earth but a small forest patch in southern Brazil. Don’t let its size fool you.

In 2014, it made history by halting the construction of a hydroelectric dam that would have wiped out its only home.

With just over 1,000 individuals left in the wild, the species is listed as critically endangered. In addition to climate change, the little toad suffers from the advance of agriculture and the threat of wildlife trafficking.

But this tiny hero doesn’t shy away from a challenge. In 2024, catastrophic floods swept through southern Brazil, submerging entire landscapes — including the fragile habitat this little survivor depends on. Did it make it through? Or was this finally too much? Michelle Abadie, a researcher who has been studying the species for more than 15 years, went to the field to find out. Mongabay joined her on this mission to discover why even the smallest creatures can have an outsized impact.

Curious to see what happens next? Press play.

This tiny toad stopped a giant dam. Then historic floods hit.

The video is about 6’30” long. The post also contains a transcript which I haven’t copied here.