Every year, spectacular seasons transform our planet. As they sweep across the world, they drive all life on Earth, bringing huge opportunities and great challenges to everything. 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.