Birds do a lot of pooping, but it would be a paltry meadow or grassland if the plants did not reseed themselves.
The way some people equate natives with godliness is scary. If you believed all they said, a native would never move, and all seeds would either fall by the roots or birds would happily transport the seeds where they are meant to be. One has only to look at a meadow or prairie to know that it would take one heck of a big flock of birds to create those large colonies of native flowers and grasses. Birds do a lot of pooping, but it would be a paltry meadow or grassland if the plants did not reseed themselves. If you are going to lecture me about natives behaving themselves, do so while you help me get rid of milkweed and northern sea oats. They must have missed that lesson.