I caught two birds in my DSRT later today. They looked like female house sparrows, but I’m not skilled enough to tell for sure. The males are obvious in appearance. I was weighing the option of leaving them there as live bait when I saw two male house finches on top of the DSRT appearing to almost comfort the trapped females. At that point I questioned whether the trapped birds were actually house sparrows versus female finches so I let them out.
Does anyone have a reliable way to ID female house sparrows?