May 22nd is World Biodiversity Day (also known as the International Day for Biological Diversity). Please take a moment to read a message from the Secretariat of the Convention on Biological Diversity . Knowledge is power. Ignorance and indifference is death. Follow the link. The platypus says thanks. The last "Tasmanian Tiger" ( Thylacinus cynocephalus ), died on the night of 7 September 1933.