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The Earth teems with tiny lives, none more numerous or impactful than ants. Scientists now conservatively estimate that there are approximately 20 quadrillion individual ants alive at any given moment across the globe, a figure that is two to twenty times higher than previous estimations. While each ant is minuscule, their collective dry biomass is a staggering 12 megatons of carbon. This immense total weight surpasses the combined biomass of all wild birds and mammals on the planet, and is equivalent to about 20% of the total human biomass. These figures are the result of extensive "bottom-up" research, collating data from hundreds of studies across all continents and major biomes, significantly improving upon older "top-down" estimates.
Ants owe their extraordinary success to a combination of factors, including their ancient evolutionary history, dating back 140 to 168 million years to the Jurassic period when they evolved from wasp ancestors. Their complex eusocial organization, characterized by a division of labor within colonies, allows them to adapt and thrive in diverse environments. They are particularly abundant in tropical and subtropical regions, especially within forests.
These industrious insects are far more than just numerous; they are vital "ecosystem engineers." Through their constant tunneling, ants aerate the soil, improving water and nutrient penetration for plants. They play a crucial role in nutrient cycling by carrying organic matter into their nests for decomposition, and they are significant seed dispersers, helping plants spread to new areas. Furthermore, ants act as natural pest controllers, preying on other insects and helping to regulate populations that might otherwise damage crops and plant life. Their collective impact underscores their profound importance to the health and balance of terrestrial ecosystems worldwide.