Have you ever wondered what the world’s largest land animal might be? While some land animals (giraffes) might be taller, and some marine life (blue whales) might be heavier, one animal stands alone ...

Africa: The second-driest inhabited ... Elephants can recognise over 100 different elephants from their calls alone These huge creatures are herbivores, and they have some well-equipped tools ...

The elephant? Or the giant wildebeest ... except the lion. A pattern emerged. African herbivores were simply too aggressive for human control. Elsewhere in the world, mammals evolved in isolation ...