National Threatened Species Day is observed in Australia every September 7 to commemorate the extinction of the Tasmanian wolf, also known as the thylacine, which died in captivity on this date in 1936. The thylacine was the last member of the Thylacinidae family, which dates back to the early Miocene, and was endemic to Australia and Tasmania. The species faced significant population decline due to intensive hunting following British settlement, alongside factors such as disease and habitat encroachment. The last wild thylacine was killed in 1930, and its extinction highlights the ongoing issue of endangered species in Australia, where many species are threatened by human activities. National Threatened Species Day serves to remind the public of the importance of preserving endangered species and their habitats.