The total estimated biomass of all ants on Earth is roughly equivalent to the total biomass of all humans.
Why it is true
Recent studies estimate there are about twenty quadrillion ants in the world. Although each ant weighs very little, their colossal number means their combined carbon weight is comparable to the total weight of the global human population.
Source: Nature
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.
Related facts
There is a parasitic fungus that turns insects into 'zombies'.
There are more microorganisms in a teaspoon of soil than people on Earth.
Ants do not have lungs, breathing through small holes in their bodies called spiracles.
The total weight of all ants on Earth is approximately equal to the total weight of all human beings.