David Attenborough presents a series which reveals how animals first left the seas to colonise the land over 400 million years ago, as he introduces a host of millipedes, slugs and worms.

Telling the story of the winged insects that were the first creatures to take to the air. Ultra-slow motion cameras reveal incredible flight skills, such as dragonflies catching their prey and bluebottles flying upside down.

Looking at how insects, especially spiders, make huge use of their silk-spinning abilities in the undergrowth.

Exploring the complex alliances and partnerships which the tiny creatures of the undergrowth have with each other, and with plants.

From the African termite mounds that act as huge ventilation systems, to the bumblebee colony that reaches its maximum size towards the end of summer with conflict spreading among the female workers.