BirdLife Species Factsheet for Moluccan Cuckoo: http://datazone.birdlife.org/species/factsheet/moluccan-cuckoo-cacomantis-aeruginosus
Following the taxonomic changes arising from the HBW, BirdLife International Illustrated Handbook of the Birds of the World, Volume 1, Cacomantis heinrichi was lumped with C. aeruginosus whereas previously it had been considered most closely allied to C. variolosus. This new arrangement resulted in the newly defined species possessing a considerably larger range and including additional locations where the species is known to be relatively common and widespread, especially on Obi where it has been found to sea level (Mittermeier et al. 2013). The species is now considered to contain two subspecies and it may be reasonable to assume separate subpopulations on each of the large islands on which it occurs.
Consequently the global population of the species is considered to considerably exceed the thresholds for listing as Vulnerable under population size criterion. As it now consists of several subpopulations, the species can no longer be considered Near Threatened under C2a(ii), and the largest subpopulation is considered to considerably exceed 1,000 mature individuals.
Below species level, the subspecies C. a. heinrichi of Halmahera and Bacan is still considered rare and threatened by habitat conversion. However, following the taxonomic change, it is proposed that the species as now defined does not approach the thresholds for listing as a threatened species, hence should be listed as Least Concern.
Mittermeier, J. C.; Cottee-Jones, H. E. W.; Purba, E. C.; Ashuri, N. M.; Hesdianti, E.; Supriatna, J. 2013. A survey of the avifauna of Obi island, North Moluccas, Indonesia. Forktail 29: 128-137.