"wading birds"

After exploring many maps cataloguing the Auckland region's water (http://www.aucklandcity.govt.nz/council/documents/awireview/default.asp & http://www.watercare.co.nz/Pages/default.aspx) I came across this map. It shows designated areas for Auckland's "wading birds" - something I never would have thought up! Just beginning to touch on the role water plays in ecology..