The Black Plague killed about 30 million people in five years, 16,427 per day. The Global Flu Pandemic killed 82,137 per day. But that's nothing compared to the damage humans inflicted upon other humans: 70,000 people were killed in five seconds on August 6, 1945, in Hiroshima, Japan. Here's the horrible ranking of deaths per day.
As you will notice, despite Mother Nature's best efforts, humanity dominates the ranking. Well done, us.