The term "true sparrow" is commonly used to describe birds of the family Passeridae, which typically have thick bills and distinct markings on their facial feathers. However, there are several other synonyms that can be used to describe these small, chirping birds. Some of these include house sparrow, Eurasian sparrow, common sparrow, and field sparrow. Each of these names reflects the bird's habitat or geographic location, as sparrows can be found in a variety of environments around the world. Despite their unassuming appearance, sparrows play an important role in ecosystems by controlling insect populations and dispersing seeds.