Flyway

I was driving up to take my mom for her treatment when I spotted a huge group of Sandhill Cranes flying over the highway. Eventually, I was paralleling their flight path and saw family after family heading South. It was SO COOL! There were hundreds of them, all beginning their migration. What the heck tells them when to take off? Florida bound, I suspect. (I couldn't have found a subject more fun to see for my 700th Blip.) :D