Thirteen recently extinct monsters

Thank God, recent evolution has shown a welcome tendency to give nature's animals powerful thinking abilities, allowing us to rise to the top of the food chain. If we had lived in ancient times, we might not have been so lucky. Different times require animals to have different survival capabilities, and once upon a time, large size and ferocious habits were the most important characteristics of animals. Here are 13 of the biggest, strongest and, in some ways, weirdest animals.