EcoWorldy has a great article listing 11 extinct animals that were, amazingly, photographed before they went extinct. Some of the photographs are notably better than others, but they’re all wonderful and heartbreaking. I’m struck by how many of these animals were killed at the hands of humans, either through ruthless hunting, habitat destruction, or global warming.
My favorite of this list is the Tasmanian tiger, or Thylacine. You can see a taxidermied Thylacine at the Natural History Museum in London, but it definitely lacks the sort of charisma I imagine they had.