Extras

    Video thumbnail: NOVA Extreme Animal Weapons Preview

    NOVA

    Extreme Animal Weapons Preview

    NOVA uncovers the secrets of nature’s battleground—claws, horns, fangs and all.

    Extreme Animal Weapons Preview

    Video thumbnail: NOVA Darwin's Beetles Spar Off

    NOVA

    Darwin's Beetles Spar Off

    Beetles make up the largest group of insects on Earth. Why do so few have massive pincers?

    Darwin's Beetles Spar Off

    Video thumbnail: NOVA Why Fiddler Crabs Have Giant Claws

    NOVA

    Why Fiddler Crabs Have Giant Claws

    Fiddler crabs' large claws look intimidating, but is deadly combat their main purpose?

    Why Fiddler Crabs Have Giant Claws