[TN-Bird] Help identify seed thieves please

I have two open tray feeders. One is on a porch rail, the other about 5 feet 
up on a slender metal pole and has a cover. Someone comes at night and eats 
black oil sunflower seeds and leaves presents. These are small narrow footballs 
of chewed seed remains - about half inch long, quarter inch wide, narrow ovals 
like thin footballs. There is no fecal material but something holds the stuff 
together.  Looks more like something coughed up or spat out, but constant 
shapes. We are high on a hill with a lot of woodland, with 114 bird species and 
many mammals (rabbit, deer, possum, mice (stinking up one car) squirrels - grey 
and fox, ? flying not seen and maybe more. Anyone know who the thief is?
Thanks Ralph and Kay Brinkhurst
Lebanon, Wilson Co. TN

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