In its open country habitat, the Savannah Sparrow is most similar to Vesper and Song Sparrows. It can be told from both by its yellowish supercilium, white central crown stripe and short tail. Baird's and juvenile Grasshopper Sparrow are larger-headed and billed. When flushed, the Savannah Sparrow tends to fly fairly high to its next perch whereas Song Sparrows fly low and pump their tails, Vesper Sparrows often show considerable white in the tail and Grasshopper Sparrows fly very low.
Length and wingspan from: Robbins, C.S., Bruun, B., Zim, H.S., (1966). Birds of North America. New York: Western Publishing Company, Inc.