The Black Death is estimated to have killed 30% to 60% of Europe's population.[7] In total, the plague may have reduced the world population from an estimated 475 million to 350–375 million in the 14th century.[8] It took 200 years for the world population to recover to its previous level.[9] The plague recurred as outbreaks in Europe until the 19th century.
Animals moved from place to place bringing mating and crowding causes animals to separate and make new herds leading to different areas being populated.
