A group of scientists set out to estimate the number of ants on Earth. Their results, one said, were impossible to imagine and higher than all previous estimates. According to their research, there are about 20 quadrillion ants—20,000,000,000,000,000, or 20 with 15 zeros—on Earth. That is about 2.5 million ants for every human on the planet.
To reach this number, the scientists analyzed 489 studies of ant populations. The studies, from all over the world, covered a range of habitats including cities, deserts, and forests. Those counts of ant populations were made by collecting ants in tiny traps like a plastic cup, called pitfall traps, or counting ants on a sample of leaves on the ground.
The 20 quadrillion number, the researchers say, is a conservative, or cautiously low, estimate.…
