Red-winged Blackbirds have made their spring return to Minnesota. This male sang at the Dennison Water Treatment Ponds. The species may be the most abundant bird in North America (Yasukawa and Searcy 1995). Winter populations may exceed 190 million birds. Historically Red-wings were marshland breeders, but changed to nesting in pasture and grain fields. The species has flourished with the spread of American agriculture. Furthermore, Interstate Highway roadsides, with their barrow and drainage ditches, also support this species’ expansion.