2. 1.4 Billion Insects Per Human
Scientific estimates suggest there are around 10 quintillion insects alive at any given moment—meaning for every person on Earth, there are roughly 1.4 billion insects.
This staggering number highlights just how densely insects populate our planet.
Their tiny size allows them to occupy spaces humans barely notice, from soil and leaves to rooftops and water sources.
For more details, see the Smithsonian’s BugInfo.