Fur-birds?

Last spring at the Plainsboro Preserve I noticed a couple of unusual "birds" at their bird feeders [1]. What was especially unusual about these birds was that their wings looked more like forelegs, and that their plumage had a furriness that you rarely see in adult birds [2]. I'm still struggling to ID them [3].

Okay, enough of that. These are pictures of a Gray Squirrel and a Woodchuck (aka Groundhog) that were raiding the bird feeders. I asked at the desk whether they do anything to discourage these guys from eating food intended for birds, and they said they don't.

April 20, 2023 at the Plainsboro Preserve
Photo 272673902, (c) jpviolette, some rights reserved (CC BY-NC)

April 20, 2023 at the Plainsboro Preserve
Photo 272674231, (c) jpviolette, some rights reserved (CC BY-NC)

[1] They obviously had to be birds since it would be unethical for non-birds to eat at bird feeders.

[2] Some birds have a fluffy look when very young, but these birds had obviously fledged and were out foraging for food.

[3] I'm fairly sure they're different species of birds, though sometimes sexual dimorphism can make species of the opposite sex look surprisingly different.

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