Tiny spiders have a huge brain , sometimes bigger than their body.
For the study at the Smithsonian Tropical Research Institute they examined nine tipes of spider species from six web-weaving families.
The researchers found like a rule : the smaller the spider, the bigger its brain if you compare with the body size.
In some spiders, the central nervous system took up nearly 80 percent of the space in their bodies, sometimes is to big for be just in head as humans and the most of the animals, so some spiders have the brain as well from head to legs.
Taking just for the brain so much space of spider’s body would seem to be a problem for a spider's other organs.
Just by the way the spiders are, it would make sense that sometimes they are immune to the arachnids.
For instance, another spiders which the researchers examined in a separate study, the adult's digestive its from head and body cavity.
Presumably, large brains are necessary to do big webs, a behavior thought to be more complex that the life of a simple beetle.Still, three so-called "kleptoparasitic" spiderswhich have lost the ability to do webs, they never try to steal insects from other spiders having the opportunity,so that had no signs of having a relatively small brain .Of course, being quick and clever also requires a certain level of smarts, which may explain why spider-burglars seem to have just as small brain as the insects they steal.
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http://news.nationalgeographic.com/news/archives/animals/
Irene Rodríguez Infante
