5.Tigers (Panthera tigris) ... and exceptional hunting techniques, it undeniably deserves its reputation as one of the most captivating and powerful species in the snake world.

The most common cause of the decline of a tiger species/subspecies is us human, whether from hunting or destroying their habitat. 4 / 9. Slavek Ruta/Shutterstock. Siberian.

Scientists have assembled the most complete Tasmanian tiger genome to date from a century-old pickled head, providing a full DNA blueprint to potentially bring the extinct species back to life.