Natural World visits the Arizona desert, where a new honey ant queen wages an intense battle for survival as she attempts to build and defend her empire. Eliminating rivals with ruthless efficiency, sacrificing thousands in her quest for domination, murder, cannibalism, genocide - she will do anything to keep her crown.

Empire of the Ants is the epic story of one honey ant queen's dramatic rise to power - her brutal fall from grace.

Looking at the secret lives of the wildlife in one of Britain's favourite gardens. Shot by Charlie Hamilton-James, this film follows various animals, from the family of foxes that play after hours in the pleasure gardens, to the toads in the Italian garden and the badgers that clear up the tea rooms at night. Set against the background of the gardening year, these stories reveal life behind the scenes at Heligan.

The Komodo dragon was discovered one hundred years ago, yet the true nature of the biggest lizard in the world is only just being uncovered. Using hi-tech tools to take a fresh look at this prehistoric beast, Dr Bryan Fry discovers there is a lot more to the dragon than meets the eye - from hidden venom glands to its secret origins.

The killer whale is one of the most feared predators in the ocean and most would consider it madness to enter the water with one. But New Zealander Dr Ingrid Visser thinks differently - and by swimming with her beloved whales she has come to know almost all of them by sight. But there's been an unusual number of deaths recently and Ingrid is on a mission to find out what is going on. Her findings reveal disturbing new information about the health of our oceans.

Sir David Attenborough tells the stories of the world's best animal architects. There are house-proud bower birds, who only find a mate if they decorate their homes perfectly. There are hornets, who build electric central-heating systems, and the star-nosed mole whose house is so well designed that his favourite meal of worms literally drop in for dinner. From larders to nurseries and from high-rises to subway systems, Attenborough shows that the animal architects have designed it way before we humans.

The slow loris is the real-life gremlin, extremely cute but with a venom that can kill. Now it's also a YouTube superstar with millions of hits. Dr Anna Nekaris travels to the jungles of Java to solve the riddle of its toxic bite, but a shocking discovery awaits.

A young tigress is chosen to found a new dynasty. Airlifted from her home in an Indian park to life in a new reserve, Baghani the tigress must fight with leopards for territory and learn to hunt dangerous wild boar. Also released is Rajore, a hot blooded young male. For two years every aspect of their lives are followed by the camera. Will they mate and start a family, or will they be killed by poachers?

A mother grizzly bear brings up her two cubs in the wilds of Alaska. She must keep them safe from prowling males, teach them to hunt and prepare them to survive the savage winter. Alaska has the highest density of grizzlies in the world, so fights and face-offs are common. Biologist Chris Morgan spends the summer in this city of bears - often getting far too close for comfort.

Pure white lemurs called silky sifaka live in the remote rainforests of Madagascar. They are one of the rarest animals in the world. Now a passionate scientist joins forces with an undercover detective to investigate whether there is a link between these endangered lemurs, illegal logging and expensive guitars in the USA.

Africa's wildest river is home to the most spectacular wildlife. Hippos fight for territory while herds of elephant, water buffalo and zebra depend on it for life. In the wet season the rains burst the riverbanks and everyone, including people, must move whilst fish swim through the villages. In the dry season the creatures fight over the few pools of water while predators prowl. At its heart it plunges over Victoria Falls and into wild ravines before draining into the Indian Ocean, where storm clouds cycle the water back into the heart of Africa.

The queen African honeybee rules the savannah - even elephants panic at the buzzing of her hive. This recreates the life of the queen and her colony as they fight to survive. Ground-breaking close-up photography shows a bee-eye view of their world, from the queen murdering her sisters to fighting off giant invaders and eventually migrating across the savannah to the great Mount Kenya.

Accompanied by short film Safe in the City with Dr George McGavin on the growth of the urban beekeeper.

The Jungle Book's Baloo the bear character is based on the secretive sloth bear who lives in India's wildest places. The real Baloo does chase fancy ants, but his life is a lot tougher than that of his fictional friend.

Narrated by David Attenborough, this is the first film ever made on these shy creatures and it follows a young male called Baloo as he grows up in the harsh Karnataka landscape, fending off foes and finding food. Baloo's mother is also nearby with two new cubs on her back, trying to keep them safe from prowling leopards.

Seals, parakeets and even pelicans that eat pigeons have all made London their home. That's as well as badgers, foxes, scorpions, and pigeons that ride the tube. But even more wonderful are the people who love the exotic wildlife of our capital, from Billingsgate fish porters to Indian Chefs to 'Crayfish Bob', who scours London's canals for Turkish invaders. This is a warm-hearted portrait of the world's greenest capital city and the Londoners who love its secret wildlife.