Ruffed grouse are famous for actually seeking out human company, and I
believe it's the first year young adults newly kicked out of the family group. At my
brother's house in Underhill, a grouse attached himself to the whole family,
including the dog (!), for many months. "Peter Partridge" ran out of the woods
whenever my brother, his wife or my young niece stepped outside and called.
The bird would lean against their legs and look up in apparent adoration. My
brother and Peter P. had long conversations in grouse language, chuckling and
making small whistles to each other. Once when I was visiting, I got to sit on
the stairs and have the grouse stand on my sneakers and stare earnestly into
my face. It disappeared for many months and then reappeared the following year
(apparently the same bird, as it was familiar with the dog and with where the
bag of cracked corn was stashed).
Another time, when a friend and I were cutting downed trees in the woods (he
cutting, me stacking), a grouse joined us and began following us back and
forth, walking at my right heel like a well-trained dog. It didn't even appear
really uneasy with the chainsaw noise.
Peter Partridge, by the way, became overly comfortable with all human
activity, including moving cars. It was difficult to leave their driveway, as the
grouse would escort cars to the road, often very close to the front tires. He met
his end when he got hit by a car passing right at the end of their driveway.