Darwin's Super Pooping Worm Spectacular by Polly Owen & Gwen Millward

Darwin suspected worms were special but his scientist friends didn't take him seriously. In a quest to find out the worms' special talent, Darwin played the bassoon to the worms to see if they could hear, laid out a picnic treasure hunt for them to see how well they could smell, among many other bizarre but entirely true experiments. But so far Darwin didn't find anything extra special about worms.

Until, one day he realised that worms do have a superpower. They POO!  Without their nutrient rich waste there would be no plants or animals on earth!