A sparrow has a short, thick beak that can crush seeds easily. Tree sparrows eat weed seeds, crabgrass, pigweed, sedge etc. and sometimes incects. Sparrows are related to finches, grosbeaks, buntings, and juncos. This bird family is the biggest family in the world and in the United States. Some sparrows are small but they can be a little bigger than other sparrows.
Sparrows are small but successful.