The African elephant is the world's largest land mammal – with males on average measuring up to 3m high and weighing up to 6 tonnes. Males only reach their full size at 35-40 years - that’s well over half their lifespan as wild elephants can live for up to 60-70 years. And it’s not just the adults – even calves are huge! At birth elephants can weigh 120kg - that’s almost 19 stone.