This the caterpillar of the cecropia moth, It is huge!!!! it seems it would be more able to eat a bird than the other way around!! This picture is from last June, one wonders if it could possibly be the caterpillar of the moth we saw this year. It has a wide variety of host plants and quite a few are here on the farm -cherry, plum, apple, elderberry, box elder, maple, birch and willow, linden, elm, sassafras and lilac.