Molluscs in human service

[Bonobo]

Wow, I had no idea that a few water supply stations in Poland use local fresh water mussels to monitor the quality of water. They immediately close their shells when water is contaminated and the alarm signal is sent to the headquarters. Funny.

tvn24.pl/poznan/poznan-malze-filtruja-wode-sprawdzaja-czy-woda-jest-zanieczyszczona-czy-czysta-4690274