Discovered by seal hunters at the beginning of the nineteenth century, the Hawaiian monk seal was slaughtered with such thoroughness that by the end of the century it was almost extinct. Since then it has slowly built up again to a population of about 1,200 in 1958. This is the total world population. Dale Rice studied the breeding behaviour of this monk seal when working on the albatrosses in Hawaii as a wildlife biologist for the Fish and Wildlife Service. Today he is in charge of whale research at the Marine Mammal Biological Laboratory in Seattle. The article is reproduced by kind permission from “Natural History” journal of the American Museum of Natural History.