Rats and mice may outnumber humans, but other species are in trouble
In 2011 the human population surpassed 7 billion, but RiAus asks in its weekly video how that compares to other animal species.
The combined population of our home planet is almost impossible to quantify. While the human population is in the billions, bacterial species measure in the quadrillion quadrillions!
You can see more from RiAus plus links to useful sites on global population growth here.