Bluebirds

I've placed upon a post at home, a house where bluebirds live. They come in early spring each year, and me much pleasure give. The male arrives and then his mate, both looking at their best. She quickly settles down to work, to build her family's nest. She gathers straw and carries twine, I've placed there for this day. Alone he sits in a tree so near, chasing other birds away. With nest complete they're off to hunt, upon our fence they sit. With eyes so keen bugs hardly move, and on wings their down to get. Her nesting chores being now at hand, she must be at her best. For now when off to eat she goes, The sparrows steal her nest. As they return the fight is on, There, victorious once more. But then I notice they've caught the eye, of the neighbors cat next door. I wonder now if I'm doing right to have them in our yard? I've seen the cats eat their young, to me this has been hard. I know that in Mans scheme of things, this may not seem like much. The enjoyment and beauty they provide, is surely by Gods touch.