With the sun shining and the flowers blooming, summer is a season of splendid abundance, and the long hours of daylight make life burst out in a riot of activity. However, in certain regions there can be sweltering heat. As this documentary reveals, for a range of species, from sneaky ring-tailed lemurs to battling ibex and penguins to colour-changing lizards, summer is a time when the living is not always easy. Narrated by Andrew Scott