The Thylacine Films

Now online is most of the existing film footage of thylacines, a dog-like marsupial from Tasmania that went extinct in 1936. (Hat tip to Pharyngula, where there's some discussion of the possibility of cloning them from the DNA samples of three individuals that has been preserved.) More discussion by Tara Smith at Aetiology, whose post at Panda's Thumb kicked this off.