In the morning we arrive in Puerto Ayora, on Santa Cruz Island. Santa Cruz is the second largest in the island group, and has the largest population, with Puerto Ayora as its main town. It also boasts the most varied of the islands’ vegetation zones: coastal, transition, scalesia, miconia and pampa. The Charles Darwin Research Station is a 10 minute walk from the centre of the town. Here, an exhibition centre displays photos of recent volcanic eruptions, charts outlining geological formations and drawings of the evolutionary development of endemic species. A corral houses adult Galapagos Tortoises, and a nursery cares for young tortoises until they are about three years old, when their shells have hardened enough to resist attack from feral dogs. In the afternoon we may have the opportunity to visit the highlands and see giant land tortoises in the wild.