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Caves (4/11)

This is also part of this series: Planet Earth - Series I (5)

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Subjects: Animal Behaviour, Animals, Geography, Natural History, Nature, Science

Grade Level: JrH-Adult
Producer: BBC
Closed Captioned: No

Running Time: 50 mins
Country of Origin: Great Britain
Study Guide: No

Copyright Date: 2006
Available in French: Yes

Caves are one of the only habitats not directly driven by sunlight, but this doesn't mean there is no wildlife. This episode probes the mysterious, perpetual darkness and reveals the unknown underground world of caves, caverns and tunnels. Caves are Planet Earth's final frontier and this programme goes where few have been before.

The Cave of Swallows in Mexico is a 400-metre vertical shaft. It is deep enough to engulf the Empire State Building, yet few people even know of its existence. Lechuguilla cave, in the USA, is 193 kilometres long and 500 metres deep. It contains whole chambers filled with the most astonishing crystals, including some a staggering six metres long. There is nothing like it anywhere on earth, yet the name Lechuguilla is virtually unheard of. Cave angel fish are perhaps the most adapted creatures on Earth, since they live only in cave waterfalls, hanging on with microscopic hooks on their flattened fins. Until now they have never been filmed before. Deer Cave in Borneo is a daytime retreat for five million bats. Their droppings support an entire community of creatures. Shine a light on one massive pile of droppings and the whole place shimmers with millions of dung-eating insects.

Planet Earth descends into an undiscovered world to introduce some of the most remarkable and bizarre animals on earth, from cave swiftlets, which navigate through pitch-black caverns using echo locations and build nests out of saliva, to the troglodytes - weird creatures that never see daylight nor ever set foot on the surface. Specialists like the Texas cave salamander and Thailand's cave angel fish have neither eyes nor pigment. The entire populations of both are found in just a couple of caves.

Gaining unique access to a hidden world including poisonous caves and flooded caves - full of stalactites, stalagmites, snotites and troglodytes - few natural history programmes can boast such a wealth of surprises.

Narrated by David Attenborough.

Awards: Banff World Television Awards 2006 - Nomination: Popular Science & Natural History Programs

Links: http://www.bbc.co.uk/nature/animals/planetearth/

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