The Tasmanian tiger (thylacine) was a beautiful carnivorous marsupial that went extinct in the 1930s in part due to human hunting and encroachment on the animal's natural habitats. (To this day though, people report occasional sightings in the region.) There are a handful of film clips of the Thylacine shot at the Beaumaris zoo and the London zoo and now researchers from the Tasmanian Tiger Archives Facebook Group collaborating with the State Library and Archive uncovered this additional footage seen above.
More about the Thylacine at the Australian Museum.
Also, enjoy this terrific New Yorker feature from 2018 by Brooke Jarvis: "The Obsessive Search for the Tasmanian Tiger."