The world's biggest beasts have always captured the imagination. But whilst being big can have its advantages, it also comes with sizeable challenges. Take the world's largest lizard, the Komodo dragon, whose huge appetite means it must take on prey ten times its weight, or the tallest animal of them all - the giraffe - who, with such a long neck, must control immense blood pressure. Nature's biggest beasts must go to extraordinary lengths to thrive.

Originally released by BBC Worldwide Learning, 2018. Streaming video file encoded with permission for digital streaming by Infobase on May 22, 2019.

Blue Whales (4:26); --Giraffes (5:03); -- Komodo Dragons (5:37); -- Invertebrates (5:44); -- Flying Foxes (4:04); -- Adaptations to the Cold (4:49); -- Land and Sea Mobility (3:44); -- Ostriches (7:20); -- Animal Parenting (5:11); -- Corals (4:36); -- Credits: Nature's Biggest Beasts (0:30); .