Help with ID of odd 'pellet's in bird feeder.
For you birdy folks on this forum, I'm hoping you can help. I've googled this to death and am getting no where.
I'll try to post a picture soon as I can.
For the past 3 weeks I have found what I believe are regurgitated or 'spit out' wads of crushed up sunflower seed shells in one of my feeders. Sort of like an owl pellet I guess. But these are 1/2" to 3/4" long and ~1/4" wide, oblong or crescent shaped. Appears to be undigested, chewed up shells only, dry. Doesn't look like feces. And they only show up at night. Feeder is cleaned each am, and none of these pellets show up during the day after repeated use by blue jays, finches, grosbeaks, and ocassionally squirrels and chipmunks. But each morning there are 20 to 40 of these pellets mostly deposited in the corners.
Feeder is a platform with a roof over it, attached to the deck railing. Black oil sunflower seeds only.
Any idea what bird or critter is leaving them?