Moorhens (Gallinula chloropus) sing and cry and croak and peep and whistle and quack. If you hear a very strange sound coming from the marsh 10 to 1 it's a Moorhen. In this sample two of them announce their presence.
Alae ula or Hawaiian moorhenSubspecies is endemic to the Hawaiian islandsFederally listed as an endangered species"Domesticated" (Waimea Valley, Oahu)nativeplants.hawaii.edu