Megalochelydra

Megalochelydra (name meaning great tortoise), known as hell turtle, super turtle, terror turtle, death turtle or trapjaw turtle by popular media, is an extinct species of giant turtle that lived in what is now Mongolia, China, Europe, and North America during the Late Cretaceous. Megalochelydra was the biggest turtle on Earth, even bigger than Archelon of the same time or even Stupendemys (the biggest freshwater turtle), it grew to about 30 feet long and weighed about 12 tons. resembles an outdated turtle-like depiction of Therizinosaurus in the mid-20th century, but Megalochelydra was truly a turtle, having a shell similar to softshell turtles, snapping turtle-like clawed feet for digging out nests out of mud and/or sand, and a bird-like sharp beak for hunting small-to-medium-sized aquatic prey as well as defense against other predators (land or aquatic), as analysis of the jaw strength of Megalochelydra has been determined to be extremely strong, giving the Megalochelydra one of, if not, the strongest bite force of any animal in Earth's history, even stronger than that of Tyrannosaurus. It is now known that Megalochelydra was tolerant to both freshwater and saltwater, thanks to bone analysis and where the fossils of Megalochelydra were found, Megalochelydra lived throughout large lakes, rivers, and even shorelines. It is unknown why did Megalochelydra became extinct, but it may have been due to the asteroid/comet impact and its effects that struck the Gulf of Mexico, with its effects causing a cloud of dust and ash blocking out the sunlight, killing the prey items through starvation, leaving Megalochelydra without any food sources, ending the reign of the Megalochelydra.