Big Cat Diary, also known as Big Cat Week or Big Cat Live, is a long-running nature documentary series on BBC television which follows the lives of African big cats in Kenya s Masai Mara. The first series, broadcast on BBC One in 1996, was developed and jointly produced by Keith Scholey, who would go on to become Head of the BBC s Natural History Unit. The original presenters, Jonathan Scott and Simon King, were joined by Saba Douglas-Hamilton from 2002 onwards. The Natural History Unit originally wanted to film in the Serengeti National Park in Tanzania, but when this proved too expensive, they switched to Kenya. Filming is timed to coincide with the arrival of the annual wildebeest migration in the Mara, which is when the most predators gather to take advantage of abundant prey. Each series has followed the daily lives of a lion pride, a cheetah family and a leopard family. The crew, which can number up to 60 people, use specially modified 4WD vehicles to travel around the Mara, tracking, spotting and filming the cats. The presenters also travel in the vehicles, addressing the camera as the action unfolds in front of them.