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Extras

Video thumbnail: Nature The Animal House - Preview

Nature

The Animal House - Preview

Airs Wednesday, February 12, 2014 at 8:00 p.m. ET/PT. Check your local listings.

The Animal House - Preview

Video thumbnail: Nature The Animal House - Preview

Nature

The Animal House - Preview

Premieres Wednesday, November 2, 2011 8:00 p.m. ET/PT. Check your local listings.

The Animal House - Preview

Video thumbnail: Nature A City of Twelve Million

Nature

A City of Twelve Million

Leafcutter ants shift 40 tons of soil to make their subterranean home.

A City of Twelve Million

Video thumbnail: Nature A Crystal Chalice

Nature

A Crystal Chalice

Male swiftlets use their own building material, gluey saliva, to make their nests.

A Crystal Chalice

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