Surprised actually for all the years I have had out trail cams and the quantity of grouse I see I have very rarely captured a pic of one on the trail cam. Maybe there are to small to trigger them.
I had a pair that would come out every evening before dark, sounding like herd of hippo's coming across the dead leaves to take a few grains of corn and then head back into the cedars. They make far more noise than a 200lb deer.
I hate it when your walking home in the dark and you jump one on the side of the trail, scares the bejesus out of you :)