Man is the only land vertebrate to have successfully colonised the remote Easter Island, and his domestic animals graze almost the whole island. Three, perhaps four species of sea turtle occur, and of fourteen species of seabird, eight breed, some in very large numbers. Five bird species have been introduced with unhappy results. There is now a weekly air service to Easter Island, and Dr. Harrisson, who spent eight days there early this year, urges the need for careful study of conservation problems and support for the Chilean government.