And relax … a sea lion joins in on a beach siesta on San Cristóbal island, Galápagos, Ecuador Photograph: Anadolu/Getty Images One of five a day … a giant tortoise snacks at Galápagos national park Photograph: Anadolu/Getty Images Sooty terns fill the skies as they return to Johnston Island, a tiny outcropping in the Pacific west of Hawaii. The atoll is a wildlife refuge and an important breeding ground for many birds, but it was used extensively by the US air force in the 20th century – as an airbase and a test site for nuclear and biological weapons, and