If you’re curious about “the bog” I referenced, that is Sax Zim Bog—a birding hot spot in Minnesota, especially in winter. You can find tons of great information at the Friends of Sax Zim Bog page. If you’ve never been, it’s best to hire a guide or consider going to the festival. The bog is large and without a strategy you can spend a lot of time driving without seeing any birds and wondering where to pee.
The bog is great birding year round, but there some birds that are easier to see in winter or can only be found there in winter. Target species for birders include (but is certainly not limited to) great gray owl, northern hawk owl, Canada jay, pine grosbeak, evening grosbeak, common redpolls, hoary redpolls, snowy owls, black-billed magpie and boreal chickadee. Several areas host bird feeders, some on private land, some on public. Friends of SZ has a great map pointing out the feeding stations. Some of the birds are after seed and others are after meat and fat in the form of chunks of venison.