No. 5 Caspian Tiger
The Caspian tiger, also known as the Hyrcanian tiger, the Mazandaran tiger, the Persian tiger and the Turan tiger, is an extinct tiger subspecies that had been recorded in the wild until the early 1970s, and formerly inhabited the sparse forest habitats and riverine corridors west and south of the Caspian Sea, from Turkey, Iran and east through Central Asia into the Takla Makan desert of Xinjiang, China. There are no individuals in captivity.
No. 4 Thylacine
The Thylacine was the largest known carnivorous marsupial of modern times. It is commonly known as the Tasmanian tiger (because of its striped lower back) or the Tasmanian wolf. Native to continental Australia, Tasmania and New Guinea, it is believed to have become extinct in the 20th century. It was the last extant member of its family, Thylacinidae; specimens of other members of the family have been found in the fossil record dating back to the late Oligocene.
No. 3 Quagga
The quagga is an extinct subspecies of plains zebra that lived in South Africa until the 19th century. It was long thought to be a distinct species, but genetic studies have shown it to be the southernmost subspecies of plains zebra. It is considered particularly close to Burchell’s zebra. Its name is derived from its call, which sounds like “kwa-ha-ha”
No. 2 Megalodon
Megalodon “big tooth” “big, mighty” and odoús, “tooth”—whose stem is odont-, as seen in the genitive case form is an extinct species of shark that lived approximately 15.9 to 2.6 million years ago, during the Cenozoic Era (middle Miocene to end of Pliocene).
No. 1 Tyrannosaurus Rex (T-Rex)
Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. The species Tyrannosaurus rex (rex meaning “king” in Latin), commonly abbreviated to T. rex, is one of the most well-represented of the large theropods. Tyrannosaurus lived throughout what is now western North America, which then was an island continent named Laramidia. Tyrannosaurus had a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 68 to 66 million years ago. It was the last known member of the tyrannosaurids, and among the last non-avian dinosaurs, to exist before the Cretaceous–Paleogene extinction event.