All mammals can exhibit it. I do not think anxiety is a disorder, but rather a natural response. It's literally our "fight or flight" mechanism. I think the d

All mammals can exhibit it. I do not think anxiety is a disorder, but rather a natural response. It's literally our "fight or flight" mechanism. I think the disorder part comes from the fact that such mechanisms are being hit constantly for so many people that it causes disorder in one's life. There is no rest for the system, and it's constantly under some sort of strain. Yes, anxiety might save us from a saber-tooth tiger, but I do not think situations like that were an all-day-every-day kind of occurrence like the things that cause anxiety in today's time.