The male cardinal is looking out for the female who was eating.
I often catch the males guarding the females. Around here I think its from the hawks who love easy prey.
I have found most the birds around here like the open feeders.
I have one closed feeder the titmouse, sparrows and woodpeckers like its a house type with plexiglass.
I have 12 bird feeders spread across our yard area which is one acre. I generally feed a few times a week and the rest of the time they are on their own. We have lots of plants and trees that produce bird friendly berries or fruit.
Nature gives us the presence of her beauty and requires so little from us. Appreciate the little things because their beauty is all around us.