What animals outpopulate humans?
Among land-based vertebrates, humanity's closest rivals in terms of sheer numbers are probably the brown rat (which, everyone agrees, outnumber us — but no one seems eager to count) and the domestic chicken (which numbered 18.
Among land-based vertebrates, humanity's closest rivals in terms of sheer numbers are probably the brown rat (which, everyone agrees, outnumber us — but no one seems eager to count) and the domestic chicken (which numbered 18.