As the years have passed, I've begun to notice seasonal changes with more awareness than when I was a young buck. Now there are other warning signs that assist in that evaluation, mostly having to do with aching joints. I'm pretty sure that tribes had a much keener awareness of this process because they lived out in it year-round. It became a natural sense and they followed the food sources according to those seasons just like it was second nature.
I ran into an Inuit friend the other day and this particular subject came up. He used to live in the far North. I asked him how the seasonal changes impacted his village. "It was pretty simple. We'd get in the truck and drive to the grocery store down the road just like everyone else."
One of these days I swear I'll learn.