Discussion
While the Greek word strouthion is certainly the name for the sparrow, the Hebrew tsippor is actually an inclusive word that refers to sparrow-sized birds in general. These small birds, especially sparrows, were caught in nets and traps and were an important part of the diet of poor people.
Description

Special significance or symbolism
Sparrows were considered clean birds and were associated with the poor.
Translation
Sparrows or sparrow-like small birds are found all over the world. Finding a local word is not usually difficult. The reference to “a lonely bird on the housetop” in PSA 102:7 takes on additional meaning if the sparrow was intended, since it is a bird that is seldom seen alone. It would then indicate the psalmist’s sense of loneliness at being separated from those with whom he belongs.