The third instalment examines the spiders and others that produce silk. Attenborough visits New Zealand's Waitomo Caves, which are inhabited by fungus gnats whose illuminated larvae sit atop glistening, beaded filaments to lure their prey.
The first episode tells how invertebrates became the first creatures of any kind to colonise dry land. Their forerunners were shelled and segmented sea creatures that existed 400 million years ago. Some of them ventured out of the water to lay their eggs in safety, and Attenborough compares those first steps with today's mass spawning of horseshoe crabs off the Atlantic coast of North America.
2005 • Nature
The next programme deals with flying insects. It begins in Central Europe, where the Körös River plays host to millions of giant mayflies as they rise from their larval skins to mate. — the climax of their lives. Mayflies and dragonflies were among the first to take to the air about 320 million years ago, and fossils reveal that some were similar in size to a seagull. Damselflies are also looked at in detail.
2005 • Nature
The final programme looks at the superorganisms formed by bees, ants and termites. Attenborough reveals that their colonies, whose individuals were once considered purely servile, are "full of conflict, power struggles and mutinies." They evolved when such creatures moved away from a solitary existence and started building nests side-by-side, which led to a collective approach to caring for their young.
2005 • Nature
Peregrine falcons are slowly rebounding from the edge of extinction, while snapping turtles face different life-threatening challenges. Learn about conservation efforts in Ontario, Canada to help give these threatened species a boost while they fight back.
They cannot tolerate sunlight; some of them are even blind. However they are one of the world's most ingenious builders: Termites. They build high-risers that are, relatively speaking, 25 times higher than the Empire State Building in New York. They are the only animals that have managed to build an air-conditioning system without electricity. Their nests are architectural masterpieces that rise up to eight meters from the ground and contain brood chambers for larvae, corridors for transportation and fungal gardens for nutrition. Termites - The Inner Sanctum takes us along a journey into another world. Visit the skillfully built termite mounds in the savannah, termite nests in the tropical rainforest with their colossal columns of termites foraging for food - and the termites that wreak terrible damage to wood-framed homes. Filmed in the US, Kenya and Borneo.
2011 • Nature
Across the dunes of the Kalahari, a towering, 200-year-old tree extends its branches to the heavens. This camel thorn Acacia is a secret refuge for those in the know. Colonies of sociable weavers use its branches for their oversized nests. Oryx, kudu, and other herbivores feed on her ripened pods, helping soften the seeds for germination. As the rainy season descends, its branches become draped with golden flowers, a magnet for pollinating insects. For many, the Acacia is a 'tree of life.' It's a relationship as old as the Kalahari itself.