BBC Earth

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Steve takes a look at the incredible world of reptiles and discovers what makes them cold-blooded killers.

First up he looks at their weapons. From the chameleon's spring-loaded turbo tongue to the alligator snapping turtle's lethal jaws. Next Steve tests out the most powerful bites on the planet when he encounters reptilian giants – the crocodiles. Finally Steve investigates the super senses of snakes before heading to the remote island of Komodo to meet the largest lizard alive.

Next on...

Series 1, Episode 1

BBC Earth

Steve Backshall boards an ice-breaker and hunts for the Arctic's top predator - the cuddly-looking Polar Bear. 1/31

Series 1, Episode 1

BBC Earth

Steve Backshall boards an ice-breaker and hunts for the Arctic's top predator - the cuddly-looking Polar Bear. 1/31

Series 1, Episode 1

BBC Earth

Steve Backshall boards an ice-breaker and hunts for the Arctic's top predator - the cuddly-looking Polar Bear. 1/31

Series 1, Episode 1

BBC Earth

Steve Backshall boards an ice-breaker and hunts for the Arctic's top predator - the cuddly-looking Polar Bear. 1/31

Series 1, Episode 2

BBC Earth

Steve heads to Somerset Island in the Canadian Arctic to search for the musk ox and an Arctic fox. 2/31

Series 1, Episode 2

BBC Earth

Steve heads to Somerset Island in the Canadian Arctic to search for the musk ox and an Arctic fox. 2/31

Series 1, Episode 2

BBC Earth

Steve heads to Somerset Island in the Canadian Arctic to search for the musk ox and an Arctic fox. 2/31

Series 1, Episode 2

BBC Earth

Steve heads to Somerset Island in the Canadian Arctic to search for the musk ox and an Arctic fox. 2/31

Series 1, Episode 2

BBC Earth

Steve heads to Somerset Island in the Canadian Arctic to search for the musk ox and an Arctic fox. 2/31

Series 1, Episode 3

BBC Earth

Steve is pushed to the limit when he abseils into the heart of a glacier in Alaska. 3/31

Series 1, Episode 3

BBC Earth

Steve is pushed to the limit when he abseils into the heart of a glacier in Alaska. 3/31

Series 1, Episode 2

BBC Earth

Steve heads to Somerset Island in the Canadian Arctic to search for the musk ox and an Arctic fox. 2/31

Series 1, Episode 3

BBC Earth

Steve is pushed to the limit when he abseils into the heart of a glacier in Alaska. 3/31

Series 1, Episode 3

BBC Earth

Steve is pushed to the limit when he abseils into the heart of a glacier in Alaska. 3/31

Series 1, Episode 3

BBC Earth

Steve is pushed to the limit when he abseils into the heart of a glacier in Alaska. 3/31

Series 1, Episode 3

BBC Earth

Steve is pushed to the limit when he abseils into the heart of a glacier in Alaska. 3/31

Series 1, Episode 4

BBC Earth

Steve tries to find an elusive sixgill shark and a toothy wolf eel in Canada. 4/31

Series 1, Episode 5

BBC Earth

Steve visits the Yellowstone national park, where he tracks grey wolves and bison. 5/31

Series 1, Episode 5

BBC Earth

Steve visits the Yellowstone national park, where he tracks grey wolves and bison. 5/31

Series 1, Episode 6

BBC Earth

Steve and his intrepid crew travel to the backwoods of North Carolina, USA, in search of the infamous timber rattlesnake. 6/31