When I was a kid I didn't think much about where they hibernate, how, or why. But they're definitely a species that continually yields fascinating revelations. Apart from their ability to sleep in leaves for 6 months or so, they're also able to learn to use door flaps and, apparently, survive flooding. They're resilient little creatures.
Every animal seems to have surprising abilities and behaviours if you're just lucky enough to see it.
If you watch robins in the spring, after the snow melts but before the ground thaws, you'll see them turning over leaves to find and eat the insects. I see a lot of this, because I have a lot of trees (rural property, with forest around me). Often there are robins migrating, who stop and fill up thanks to my lawn and its plentiful ground leaf cover.
As a child, I was taught that robins "eat worms". Well, they surely do. But I see them eating anything and everything which moves. They're a lot like chickens, I guess.
At dusk, I often see them standing around and catching moths and things which take flight. Leaping into the air and snapping them up. Fun to watch.