100 of the most heroic, inspirational and sometimes hilarious animals from history, brought to life by national treasure Clare Balding.

Bobbie the Wonder dog crossed more than 2,500 miles of plains, desert and mountains to find his way home - and became the inspiration for Lassie. 

Cher Ami the pigeon, despite being shot twice, delivered a message that saved the lives of 194 soldiers in 1918.

Trakr the police dog spent two days exhaustively searching Ground Zero and found the last survivor of the 9/11 attacks.

Ever since Alexander the Great named a city after the horse who saved his life in battle (and another after his dog), human history wouldn't be the same without the awe-inspiring tales of amazing animals.

Now BAFTA-winning presenter, number-one best-selling author and all-round national treasure Clare Balding picks out the most heroic and heartwarming (and sometimes hilarious) animals from history and tells their stories. 

From Simon the sea cat to Greyfriars Bobby's 14-year vigil over his master's grave, to the elephant that saved a small girl and Paul the World-Cup-predicting octopus, Heroic Animals brings to life incredible feats and moving moments which highlight the timeless special bond between human and animal.