When I fish the UP in Fall there will be a group hanging out. They flock up in the fall for the migration south. They change color in fall, all grey and white. I was told by some locals that sometimes the lakes will ice over at night and the young ones won't leave in time and will die because they need to run so far to become airbourne and with the ice they aren't able to run??Don't know if this is a fact but locals say it has happened. Who am I to disagree?Teach