Most populous ‘mammals’ on earth (2020 CE)Rank Animal Population1 Human 7,658,000,000 **8,000,000,000 (2022 CE)2 Cows 1,460,000,0003 (caged) pig 1,000,000,0004 sheep 1,000,000,000—Humans are driving one million species to extinction https://www.nature.com/articles/d41586-019-01448-4 (2019CE)