5 Answers

They are hiding in the woods where there is more natural shelter and food  (maybe?).   Read here>>https://www.nature.org/en-us/about-us/where-we-work/united-states/pennsylvania/stories-in-pennsylvania/wintertime-birds/

If your winter has been mild so far birds will eat seeds and things from the wild. As food gets scarcer they will come to feeders.  Cardinals and Blue jays love sunflower seeds. Try putting some of those seeds out.

If you are concerned or interested enough you might like to contact one of the Ornithology clubs in the link below for more information.

http://www.dvoc.org/DelValBirding/Organizations.htm

....notice any fat cats

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