Common Redpolls frequent our area in the winter each year but seeing them seems a hit or miss proposition as they move around quite a bit. This winter we got lucky and had a few hanging around the neighborhood for a couple of days in a big mixed flock of finch species.

During winter, some Common Redpolls tunnel into the snow to stay warm during the night. Tunnels may be more than a foot long and 4 inches under the insulating snow.

Common Redpolls can survive temperatures of –65 degrees Fahrenheit. A study in Alaska found Redpolls put on about 31 percent more plumage by weight in November than they did in July.

https://www.allaboutbirds.org/guide/Common_Redpoll/overview