Historiae Animalium (Studies on Animals), by Swiss naturalist and bibliographer Conrad Gesner (1516-1565), now appears on the popular Turning the Pages kiosks at the National Library of Medicine and is also available via the NLM Web site. This 1551 work is considered the first modern zoological work — a first attempt to describe many animals accurately, with text and hand-colored woodcuts drawn from the personal observations of Gesner and his colleagues.