Extras

    Video thumbnail: Nature Social Spiders Build Massive Nests

    Nature

    Social Spiders Build Massive Nests

    A spider found in the Caribbean and South America build nests more than 20 feet across.

    Social Spiders Build Massive Nests

    Video thumbnail: Nature Puffins Search for the Perfect Home

    Nature

    Puffins Search for the Perfect Home

    Puffins search for the perfect piece of real estate where they can raise their young.

    Puffins Search for the Perfect Home

    Video thumbnail: Nature Animal Homes: Cities - Preview

    Nature

    Animal Homes: Cities - Preview

    Premieres April 22, 2015 at 8/7c on PBS. Check your local listings.

    Animal Homes: Cities - Preview