From the parched deserts of the southwestern U.S. to the lush forests of the Costa Rican mountains, this episode covers some of the most diverse ecosystems on the planet. The creatures here have adapted to survive in an extraordinary variety of habitats, and that means a diverse array of weapons. Witness animals equipped with poisonous toxins, a feline with the strongest jaws out of all the world's wildcats, and fish with stinging tentacles. You'll be dazzled by such creatures-both predators and prey-as the terraseal pillow viper, jaguar, poison dart frog, jumping viper, rattlesnake, yellow-bellied sea snake, hammerhead shark, Portuguese man-of-war, Humboldt squid, eyelash palm pit viper, harpy eagle, and American crocodile.

Encoded with permission for digital streaming by Infobase on April 29, 2013. Learn360 is distributed by Infobase for Films for the Humanities & Sciences, Cambridge Educational, Meridian Education, and Shopware. Part of the series Deadly Dozen.

Terciopelo (2:29) -- Terciopelo Hunting (1:59) -- Lethal Blend of Grace and Power (3:53) -- Poison Dart Frog (2:14) -- Jumping Viper (3:32) -- Cascabel (3:42) -- Yellow-Bellied Sea Snake (3:49) -- Hammerhead Shark (3:57) -- Portuguese Man O' War (3:12) -- Humboldt Squid (4:18) -- Eyelash Palm Pit Viper (4:12) -- Harpy Eagles (3:26) -- American Crocodile (3:06) -- Crocodile Attacks (4:44) -- Credits: Central America: Deadly Dozen (0:29).