Prepare to march alongside millipedes, abseil with leopard slugs, squirm with giant two-meter-long worms and dance with creatures smaller than a full stop. Natural history legend David Attenborough reveals how animals first left the oceans to colonize the land over 400 million years ago. Why did this take place and how have these tiny creatures endured for so long?

From the stunning aerobatics of hoverflies in a Bristol garden to the mass migration of purple crow butterflies in Taiwan, this episode tells the story of the winged insects. The latest ultra-slow motion cameras reveal incredible flight skills, such as dragonflies catching their prey and bluebottles flying upside down. While David Attenborugh is on hand to witness the mass emergence of winged cicadas after 17 years underground.

David Attenborough investigates the power of silk, the secret weapon of the undergrowth.

Ever since they came onto land, the tiny creatures of the undergrowth have been forming alliances and partnerships with each other and with plants. Many of these relationships are staggeringly complex. While some clearly benefit both partners, others most certainly do not. Meet the bot fly which uses smaller house flies as unwitting couriers to carry its eggs to cows, where they hatch and bore into the unsuspecting animal's flesh.

How invertebrates overcome their tiny size by banding together in massive numbers.