Ancient, Beastly 'Rhizadont,' Greatest River Monster of All Time

Jeremy Wade crowns the prehistoric beast of all beasts, the 'Rhizadont,' the most monstrous river monster of all time! Bow to your Prehistoric Terror King! | http://www.animalplanet.com/tv-shows/... Watch full episodes: http://bit.ly/RiverMonstersFullEpisodes Subscribe to Animal Planet: http://www.youtube.com/subscription_c... Join us on Facebook:   / rivermonsters     / animalplanet   Follow on Twitter:   / animalplanet