After sailing before the wind twelve days, our approach to land was indicated by a black tern which flew past the ship. Tropic birds were seen on the previous day, but they roam farther than tern.
The Beagle Diary was later used to write Darwin's famous book 'Voyage of the Beagle' (1839). The narrative of the surveying voyages of His Majesty's Ships Adventure and Beagle between the years 1826 and 1836. Darwin describes each day of the voyage, some in intimate detail, during the Beagle's circumnavigation of the globe.