Beluga whales and narwhals live solely in the cold waters of the Arctic and sub-arctic. Smithsonian scientists, however, found that this may not have always been the case. They recently described a new species of toothed whale and close relative to today’s belugas and narwhals that lived some 3-4 million years ago during the Pliocene in warm water regions.
Earth is a bit over 4.5 billion years old. Life on it is only about one billion years younger. And let´s say Homo smartphonensis is a mere three years old.