Female Red-winged Blackbird

From U.S. Fish and Wildlife Service Midwest Region:

Male red-winged blackbirds are easy to identify, but females look much different. Males are highly visible as they perch on cattails. Females tend to stay more hidden in vegetation.

Photo: Female red-winged blackbird courtesy of Jen Goellnitz/Creative Commons.https://flic.kr/p/GsrrVY