Sparrows are hard for me to tell apart. There are so many of them, and they all look pretty similar. So one has to find specific distinguishing characters. For example, a Chipping Sparrow is similar to Field Sparrow, but they differ in that the line by the eye and the bill are both black in the former, while they are reddish and pink, respectively, in the latter. So hopefully, next time, I'll be able to tell what kind of sparrow I'm seeing.