Invasion of redpolls sends seeds flying

After a record-low last winter, the birds are making a comeback. Redpolls, seen in two varieties in Alaska — the common and the hoary — have attracted scientists’ attention because the birds survive super-cold temperatures. Physiologist Laurence Irving ranked redpolls’ feathers just behind pine grosbeaks for “apparent usefulness for insulation.”Redpolls have a secret weapon other small birds, including chickadees, don’t possess: food pouches on each side of their necks.