Not sure where you are but in the Midwest winter is not a great time to trap-although you will catch a few.
You have several options
Try feathers or nesting materials as bait
Try suet or sunflower chips as bait although this will attract other birds as well
Some people start by tying elevator up for a few days to let sparrows become accustomed to it
I personally didn’t have any luck with millet-a lot of sites recommended cracked corn
Check out sialis.org-tons of info
Good luck
Darrell in KC
