Despite his age, Attenborough travelled just as extensively as in all his previous productions, with each episode leapfrogging to a multitude of locations around the world.

The filming, as ever, provided many challenges. To capture footage for the first time of skunks foraging in a cave of bats, extra protective measures had to be taken for the crew, as it was a very hostile environment. The air was full of ammonia, the main occupants urinated copiously from above, and other inhabitants included flesh-eating maggots and a rattlesnake.

For a sequence featuring grizzly bears at close quarters, the camera team were accompanied by Buck Wilde, an ursine specialist. When a bear was too inquisitive he was able to command it to turn away simply by raising his hands. However, a cameraman confessed that at the time, he was sure there would come a moment when the animal would just continue towards them regardless.

To get themselves up into the canopy of a tropical rainforest the crew used a catapult to fire a fishing line 100 metres into the uppermost branches. This was then attached to a rope and pulley counterbalance system. The difficulties involved were first actually finding an ideal tree, and then, having settled on one, watching out for passing snakes and primates en route to the top.

Big cats that hunt nocturnally, such as lions, leopards and tigers, had never been extensively filmed doing so before. But the latest infrared technology revealed behaviour that had previously been guessed at from evidence discovered the next day. The series was among the first to benefit from the features of digital television. After each episode's transmission on BBC One, terrestrial viewers were shown a ten-minute featurette on an aspect of its making. Those with digital equipment had the option of switching to an interactive quiz, hosted by Attenborough.

• About mammals at BBC
• IMDb
• Wikipedia

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