Watch Tiger Island

In western Nepal, the team are continuing their tiger expedition. As monsoon storms loom and temperatures soar, the big cats are becoming more active at night. Tiger mother Goma is teaching her cubs to become independent, while Mala is struggling to keep her lone surviving cub out of trouble. The crew must adapt to the challenging conditions, deploying military-grade thermal cameras and drones to film the tigers after sunset. Under cover of darkness, the arrival of a huge dominant male presents a rare opportunity to study tiger family dynamics - but how will the male respond when he comes face to face with the cubs?

In the forests of western Nepal, a team of cinematographers, wildlife guides and a big cat scientist are on a mission to document the lives of tigers in more detail than ever before. They're equipped with the latest drone technology, stabilised zoom lenses and remotely triggered cameras - allowing them to reveal new insights into tigers' previously hidden lives. The team focus on two tiger mothers, investigating how these solitary big cats are raising cubs on an island full of dangers, including other tigers, rhinos and elephants. When a new male tiger arrives on the island, older tigress Goma must use all her experience to keep her cubs out of harm's way, whilst first-time tiger mother Mala struggles to deal with the threat, leaving her three cubs in grave danger. Meanwhile, the crew's investigations seem to be revealing that the tigers on Tiger Island are behaving in ways never seen before, as mother tigers appear to be looking after each other's cubs. This 'babysitting' behaviour is