This programme, narrated by Andrew Scott, celebrates the glorious nature of summer on Earth and the extraordinary ways animals and plants rise to the challenges it brings. With the sun shining and the flowers blooming, this is the season of splendid abundance, and the long hours of daylight make life burst out in a riot of activity. But you have to find clever ways to get your share of the good times while they last, and as temperatures soar, everything has to deal with sweltering heat. For a whole range of animals, from sneaky ring-tailed lemurs to battling ibex, and from overheated penguins to astonishing colour-changing lizards, summer is a time when the living is not always easy.
David Attenborough highlights the curiosities that have led to accusations of forgery, but have ultimately helped assist the rethinking of evolution. When early explorers brought the first specimen of a duck-billed platypus to England in 1799, it was considered so bizarre it was deemed a hoax. Similarly, the midwife toad became the centre of a scientific storm in the 1920s that led to accusations of fakery.
Formed during a cataclysmic volcanic eruption two million years ago, Tanzania's Ngorongoro Crater is home to the highest concentration of mammals in the world. Explore this vibrant ecosystem and the extraordinary geological features that have made it a haven for biodiversity.
Reptiles and amphibians look like hang-overs from the past. But they overcome their shortcomings through amazing innovation. The pebble toad turns into a rubber ball to roll and bounce from its enemies. Extreme slow-motion shows how a Jesus Christ lizard runs on water, and how a chameleon fires an extendible tongue at its prey with unfailing accuracy. The camera dives with a Niuean sea snake, which must breed on land but avoids predators by swimming to an air bubble at the end of an underwater tunnel. In a TV first, Komodo dragons hunt a huge water-buffalo, biting it to inject venom, then waiting for weeks until it dies. Ten dragons strip the carcass to the bone in four hours.