Harpy eagles are the most powerful birds of prey in the world. Standing three feet tall, with a six-foot wingspan and razor-sharp talons the size of bear claws, these birds are the heavyweight hunters of the South American rainforest. They are the top predators in the jungle canopy, feeding regularly on tree-dwelling mammals like monkeys and sloths. But scientists know very little about harpy eagles because their numbers are few and their habitat is large. Hidden in the branches of the canopy, they are rarely seen, let alone filmed. After locating a nest 130 feet above ground in an enormous Ceiba tree, wildlife filmmaker Fergus Beeley and his team of cameramen install a "nest cam" to monitor a harpy family. Over the course of a year, they struggle to document the lives of these elusive birds in Venezuela's Orinoco River jungle. The team comes dangerously close to the notoriously aggressive birds, risking serious injury for the chance to gain new insight into these Jurassic-like creatures. NATURE enters the secret world of the harpy, and provides a treasure trove of new information about this majestic species.

Harpy eagles are the most powerful birds of prey in the world. Standing three feet tall, with a six-foot wingspan and razor-sharp talons the size of bear claws, these birds are the heavyweight hunters of the South American rainforest. They are the top predators in the jungle canopy, feeding regularly on tree-dwelling mammals like monkeys and sloths. But scientists know very little about harpy eagles because their numbers are few and their habitat is large. Hidden in the branches of the canopy, they are rarely seen, let alone filmed. After locating a nest 130 feet above ground in an enormous Ceiba tree, wildlife filmmaker Fergus Beeley and his team of cameramen install a "nest cam" to monitor a harpy family. Over the course of a year, they struggle to document the lives of these elusive birds in Venezuela's Orinoco River jungle. The team comes dangerously close to the notoriously aggressive birds, risking serious injury for the chance to gain new insight into these Jurassic-like creatures. NATURE enters the secret world of the harpy, and provides a treasure trove of new information about this majestic species.

Part of the massive Tongass National Forest, Admiralty Island in Southeast Alaska supports the largest concentration of bears anywhere in the world. Sustained by a wealth of salmon streams, isolated and protected by their environment, some 1,700 Alaskan brown bears are part of a unique circle of life that has played out here for centuries

Part of the massive Tongass National Forest, Admiralty Island in Southeast Alaska supports the largest concentration of bears anywhere in the world. Sustained by a wealth of salmon streams, isolated and protected by their environment, some 1,700 Alaskan brown bears are part of a unique circle of life that has played out here for centuries

Part of the massive Tongass National Forest, Admiralty Island in Southeast Alaska supports the largest concentration of bears anywhere in the world. Sustained by a wealth of salmon streams, isolated and protected by their environment, some 1,700 Alaskan brown bears are part of a unique circle of life that has played out here for centuries

Meet the mob of street smart kangaroos moving into Australia's capital city and the ecologists following their every move. Over the course of one drought-stricken year we follow mob leader, Black Spot, and kangaroo mother, Madge, with her two young joeys - Sonny and Alice. Here is a look at what happens when human development encroaches on wildlife habitat and two very different species are forced to co-exist.

Meet the mob of street smart kangaroos moving into Australia's capital city and the ecologists following their every move. Over the course of one drought-stricken year we follow mob leader, Black Spot, and kangaroo mother, Madge, with her two young joeys - mischievous Sonny and tiny pouch-bound Alice. Here is a look at what happens when human development encroaches on wildlife habitat and two very different species are forced to co-exist.

Meetthe mob of street smart kangaroos moving into Australias capital cityand the ecologists following their every move. Over the course of onedrought-stricken year we follow mob leader, Black Spot, and kangaroomother, Madge, with her two young joeys - mischievous Sonny and tinypouch-bound Alice. Here is a look at what happens when human developmentencroaches on wildlife habitat and two very different species areforced to co-exist.