Providing the answer to a riddle that has been puzzling staff at a reserve for decades.
A team of biologists find out how nature's giants evolved and how they function.
Saba Douglas Hamilton's film about the elephants of Kenya's Samburu reserve.
What was once an expansive and prolific body of water gradually dried up.
Each year poachers kill thousands of elephants, their babies often survive for a few days.
Sir David Attenborough reveals the animals that have intrigued him the most.