"Where are the hens?"
Ricefields by the water. Common Moorhen / Tiong Air @ Ayam Perling (black) with green yellowish legs and a red ring around the top part.
The Watercock /Ayam-ayam (brown) is in its non-breeding plumage, but will turn black looking like the Moorhen when breeding in April.
Fulica atra & Amaurornis phoenicurus