aestivation Amoeba Aurora Bird black Blue-eyed Bobcats bog Borealis dispersal eukaryotes evolution Feeders flies Forest Goldfinch Groundhogs hole hybernation Kettle Mary nighttime polyploidy seed Skunks Time torpor visitors weeds Winter
Winter weeds, nighttime visitors at your birdfeeder, a study of human influence on sparrow evolution. Discussion of bird feeding.