A study in Alaska documented that Common Redpolls could survive temperatures of -65°F.
Irruptive migrations of Common Redpolls and Purple Finches typically occur every two years or so.
A Common Redpoll banded in Michigan was subsequently recovered in eastern Siberia.
Common Redpolls will quickly gather numerous whole seeds and store them in an expandable section of their throat called the diverticulum. Once the have flown to the safety of dense cover they will regurgitate the whole seed, husk it and then re-swallow the nut meat. They will also fill the diverticulum with seed just before the onset of darkness in order to provide an extra source of energy to help them survive the night.
A study in Alaska documented that Common Redpolls could survive temperatures of -65°F.