Extras

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

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