I watch, and am as a sparrow alone upon the house top. As a sparrow alone - צפור tsippor, seems to be often used for any small bird, such as the swallow, sparrow, or the like. Bochart supposes the screech owl is intended.
Related Commentaries of Psalms 102:7
Psalms 102:7
7 I watch, and am as a sparrow alone upon the house top.