Not only do people have difficulty concentrating when they are old, but even spiders have a similar situation  The webs of young spiders are neat and uniform, and the angles are perfect; the webs of old spiders may have gaps and weird shapes  The older the spider, the less structured the web
The brain of old spiders is significantly smaller than that of young spiders
 Scientists therefore believe that over time, the brain of this animal will degenerate like a human brain