The Eastern Meadowlark is very similar to the Western Meadowlark. Where their ranges overlap, they are best separated by voice. Western Meadowlark has yellow throat extending slightly farther into face than Eastern. Male Dickcissel is much smaller with a conical bill and lacks white in the tail.
Length and wingspan from: Robbins, C.S., Bruun, B., Zim, H.S., (1966). Birds of North America. New York: Western Publishing Company, Inc.