NATIVE NAME MARE IS. OIAH & OI-YAH (BLUE PHASE) OIAH-GAH-DAR (WHITEPHASE) GAH-DAR = white. 2 (2:2u) Demigretta sacra. - Reef heron BLUE-BLACK REEF HERON Range.- All through the east. Description.- As in New Hebrides. Keep a record of the numbers of dark, white and speckled birds. Habitat.- Seashore Collecting.- It is advisable in this species and others with long toes to dry the specimen in such a manner as to prevent the middle toe from bending too much. The length of the middle toe is an important measurement and it can only be measured without difficulty, if it is straight. *SEE CAYLEY. P.277 NO.32.