Wading birds (6)
(Other definitions for egrets that I've seen before include "Greets in way of certain herons (" , "Greets like fishing eagles" , "Kind of herons with long white feathers" , "waders" , "creatures" .)
(Another definition for ibises that I've seen is " Wading birds of Egypt".)
(Other definitions for terns that I've seen before include "Aquatic birds" , "Seabirds" , "Sea birds with long forked tails" , "Rents out these birds" , "Sea bird with long forked tail" .)