Spiders have to keep their extra brains in their legs

All spiders have to perform fairly complex behaviors which require an ample amount of brain power. All spider also have the same brain size no matter how big or small its body is. Because of this, small spiders have to resort to unorthodox solutions to fit all their brains inside their body. Scientists have discovered that in the smallest spiders, the central nervous system fill up almost 80 percent of their total body cavity, with about 25 percent in their legs. It's the most extreme mismatch that researchers have ever seen in regards to an organism's size and its brain power requirements.