Update! I took out the Uncle Blaine's sparrow trap out of the shed- was in there most of the winter to protect it from rain. Put it out in a different location.. added some scratch(don't give it to chickens, just know sparrows love it and is very cheap..)...... and.... OMG does it EVER work! 25 first day, 30 second day(all new birds), 15 third day.. It seems to work really well if there are 2 or more sparrows in it.. the 'lure birds' seem to make the sparrows feel very comfortable around and on the trap.
Now and then when the catch seems to be tapering off, I put a big pile of scratch on top, on the landing pad, in two areas by the trap and it just starts getting new birds in a couple hours.
But.. those birds are full of mites! Every time sparrows are taken out, I get mites crawling all over me. So I handle the trap and the birds right before going inside for a good, long shower. Clothes go right in the washer!
There's a spray you can mist on them before you pull them out of the trap... doesn't hurt them, it just kills the mites. We use it on Raptors when they come in for rehab... (I'll get the name of it) Isn't that Uncle Blaine's trap ingenious? I didn't think it would really work, but voila! You use chicken scratch... I found bread and cheetoes do the trick