They destroy plant diseases. They break down toxins. They plough the earth. They transform forests. They've survived two mass extinctions, including the one that wiped out the dinosaur. Not bad for a creature that's deaf, blind, and spineless. Who knew that earthworms were one of our planet's most important caretakers? Or that Charles Darwin devoted his last years to studying their remarkable achievements? Inspired by Darwin, Amy Stewart takes us...

When a field mouse asks Carl the earthworm why he tunnels through the dirt, Carl doesn't have an answer, so he sets off to find out.

In these episodes from the hit animated series, the Cat in the Hat leads Nick and Sally on journeys of discovery in which they learn about the world's littlest creatures, such as earthworms helping the environment, spiders spinning their webs, limpits holding on tightly, fireflies lighting their world and microscopic protozoa in a dew drop.