The are two endemic subspecies - again with no visible marks that would distinguish them from their mainland counterparts.
The Hawaiian Moorhen (Gallinula chloropus sandvicensis)
and the Hawaiian Stilt (Himantopus mexicanus knudseni)
But the most intriguing of them all was the Hawaiian Crane (Cranus machinus) which we almost missed. Good thing its name was displayed prominently. :D
Please click on the photos to see a bigger size. Mahalo!