From Green Zone under the Community dropdown menu at our website… a new study estimates how many ants are on the planet. How many ants are in the world? The answer is — tons, about 12-million tons in terms of weight, or more than that of all birds and mammals on Earth combined. The number comes out to 20-quadrillion, a 20 followed by 15 zeroes. The researchers at the University of Hong Kong add that those estimates are conservative. Their study published Monday also found the greatest number of ants on Earth is in the tropics. One of researchers said the numbers help illustrate how important ants are in the ecology of the planet.