Mapping the Republic of Letters is a cartographic tool designed by students and professors at Stanford that seeks to represent the Enlightenment era Republic of Letters, the network of correspondence between the finest thinkers of the day, such as Voltaire, Leibniz, Rousseau, Newton, Diderot, Linnaeus, Franklin and countless others. Patricia Cohen wrote an article about Mapping the Republic of Letters as well as other datamining digital humanities projects in The New York Times. The mapping tool is fun to play with but I recommend you read the blogpost where Cohen explains how to use Mapping the Republic of Letters.
Some preserved animals. The Museum Adolphi Friderici has a catalogue in progress of the King Adolf Fredrik and Queen Lovisa collections. The collections apparently formed the basis for Carl Linnaeus's knowledge of animals.