I read somewhere about a polar bear at a zoo that compulsively paced back and forth. This is not a behavior observed in polar bears in the wild; it was likely w

I read somewhere about a polar bear at a zoo that compulsively paced back and forth. This is not a behavior observed in polar bears in the wild; it was likely was caused by the fact that bears are evolved to walk dozens of miles a day, but this bear lived in a small, enclosed environment. So maybe ADHD is not adaptive, but is just a pathology caused by the mismatch between our evolved environment and our modern environment?