Nearly 4,200 members of the more than forty species of prosimians—lemurs, lorises, bush babies, and tarsiers—have lived at the Duke Lemur Center since 1966, and the center has been recording data on them. Much of that information was in handwritten logbooks until 2012, when DLC primatologist Sarah Zehr worked with software developers to create a historical record and a living database that includes information like body mass at multiple ages, ancestry, reproduction, longevity, and mortality, as well as a bank of blood, DNA, urine, skin, and organ-tissue samples.