I don't know how rabbits get enough energy from bark to keep going all winter, but somehow they do. You can see from the amount of droppings in the photo above that they tend to sit around in one spot a lot. Here one has been chomping on the big poplar that fell last fall. I've cut off its limbs so that the rabbit can reach more of them. I think it is only one rabbit that is around there. I see one fairly regularly in that area and they seemed to be quite sedentary in winter, sticking to their favorite spots.
I heard a robin and some redwing blackbirds up in the trees today. This warm spell has got them thinking it's spring.