Deer and hawks may visit a place because it now is different, but anything people normally call "lawn" is irrelevant in size as the habitat of wild mammals or large birds. I hardly think the impact is "huge" for the environment, though it may be very nice for the person observing nature from his home (yes, I see deer and rabbits very regularly, even if I have just a lawn, but there's some actual forest starting next to my plot. Neighbourhood got scared because someone spotted a wolf.)