Patrick Aryee checks out the biggest animals on Earth as he reveals why size matters in the natural world. First stop, the Americas.

Patrick Aryee gets eye to eye with Komodo dragons, orangutans and giant pandas as he explores why these creatures all came to be supersized.

Patrick Aryee tracks down great white sharks, desert giraffes and one of the last 'tusker' elephants as he explores the challenges facing nature's giants.