WILD NEW JERSEY: Smithsonian: Some Spiders Have Brains in Their Legs

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WILD NEW JERSEY: Smithsonian: Some Spiders Have Brains in Their Legs

Smithsonian: Some Spiders Have Brains in Their Legs

Photo Credit: Pamela Belding

Both vertebrates and invertebrates follow a general rule, known as Haller’s Rule, when it comes to brain and body size: “The brains of smaller animals are larger relative to body size than large-bodied forms.” Human brains are about 2 to 3 percent of our body mass, while the brains of some ants are 15 percent of their body mass. But the difference is even bigger when we talk spiders, according to a new study in Arthropod Structure & Development.