And restoration is further complicated because we cannot simply "paint in" the great flocks of wading birds (or other species) originally present. Instead, we must recreate, as fully as possible, the physical aspects of the original habitats, then wait as the animals and plants recolonize.

Restoration therefore requires a clear picture of the key physical attributes, and a good understanding of the role played by each.

Thorough knowledge of the present physical condition lets us compare with the original, and realistically assess the likelihood of successful restoration.