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The world of fauna and flora has not yet revealed all its secrets. Even today, we are discovering new species, but also how they live, feed, or even how their bodies work. Spiders are present in almost all parts of our planet. They have different sizes, different colors, etc. But did you know that the smaller the spider, the bigger its brain?

According a study by Bill Eberhard, a Smithsonian Tropical Research Institute scientist and professor at the University of Costa Rica, the smallest spiders have the biggest brains. Bill Eberhard studied nine spiders of six different species.

It is clear that the smallest spiders, such as Phidippus clarusa jumping spider, have a brain so large in relation to their height that it can take up 78% of their body, and 26% of their legs, as in Anapisona Simoni. As a result, the central nervous system of tiny spiders fills the cephalothorax (head and thorax) to overflow into the coxae (legs).

Moreover, it would seem that their brain adapts to their size. According to research by Bill Eberhard, a baby Phidippus clarus will possess a large brain, relative to its size, and an underdeveloped digestive system. On the contrary, when this spider becomes an adult, the brain will take up less space, and the digestive system will develop.

It would seem that “having a big brain” is very important for weaving webs. However, this has also been discovered in certain so-called kleptoparasitic spiders (which steal the webs of other spiders). In sum, the size of the brain does not mean that a spider is less intelligent than another. To dig deeper, here are 16 fascinating facts about spiders.


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