A close-up view of sex, bug-style, as David Attenborough talks viewers through the different ways in which creepy-crawlies reproduce. Size matters for the minuscule male orb spider, creepily sneaking up on its intended and trying to mate without her noticing, while there's no rest for the lothario-like butterfly, which has plenty of notches on its proverbial bedpost. However, the harvestman spider has no use for sex at all, and reproduces by cloning itself.
The series starts in North Africa, where two of the world's biggest predators once battled for supremacy. At 13m and seven tonnes, the carcharodontosaurus was a huge beast, a gigantic lizard-like carnivore with shark-like teeth over six inches long. It was an efficient hunter that would slash at its prey until it bled to death. But the discovery of an upper jaw in Morocco revealed an even bigger carnivorous killer - spinosaurus. Four metres longer than Tyrannosaurus rex, spinosaurus is thought to have been one of the biggest killers to ever walk the Earth. But unlike the meat-eating carcharodontosaurus, spinosaurus mainly ate fish, living and hunting almost exclusively in the water. Like all predators that share an environment, the two may once have had to compete for food. Planet Dinosaur takes a look at what one such deadly battle may have looked like and finds out which giant beast would have been most likely to survive a fight to the death.
In the first episode, the team uncover the hidden lives of three iconic animals. In the Kalahari Desert the team put cameras on wild meerkats for the first time, allowing scientists to finally understand what these miniature mammals get up to underground. Heading to Cameroon, Gordon works with scientist Mimi Swift, who is desperate to understand whether Kimbang, a four-year-old orphan chimp, has the skills she needs to be able to join a chimp family living wild in the forest. Leaving Africa for Argentina, the team have penguins carry tiny cameras far out to sea on an epic journey of up to 300 kilometres (200 miles). For the first time, scientists are able to see the tactics these charismatic characters use to catch their prey.