This Earth Day, stay in and explore the beauty, drama and spectacle of our natural world with 50 incredible natural history moments from BBC Earth based on what you've been liking and sharing. This is the third of five videos. [19:21] Walruses are among the largest seals in the world. Subscribe: bit.ly/BBCEarthSub #NaturalHistory #StayInAndExplore Watch more: Planet Earth bit.ly/PlanetEarthPlaylist Blue Planet bit.ly/BluePlanetPlaylist Planet Earth II bit.ly/PlanetEarthIIPlaylist Planet Dinosaur bit.ly/PlanetDinoPlaylist Why Do Cats Miaow? - Cats Uncovered Spider Shoots 25 Metre Web - The Hunt Pack Of Wolves Hunt a Bison - Frozen Planet Hungry Polar Bear Ambushes Seal - The Hunt Polar Bear vs Walrus - Planet Earth How do Cats Use Their Whiskers? Slow-Motion - Cats Uncovered The Bowerbird's Grand Performance! - Life Story Extraordinary Octopus Takes To Land - The Hunt Antlion Cone Death Trap - The Hunt Spider Dances For His Life!! - L...