Archived 2017 topics: Moluccan Cuckoo (Cacomantis aeruginosus): downlist to Least Concern?

BirdLife Species Factsheet for Moluccan Cuckoo:

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.

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2 Responses to Archived 2017 topics: Moluccan Cuckoo (Cacomantis aeruginosus): downlist to Least Concern?

  1. James Eaton says:

    As it occurs down to the lowlands throughout its range (Ambon, Seram, Buru, Obi, Bacan, and to a lesser extent, Halmahera), including in degraded forest I would agree that Least Concern is a suitable downlisting for the species.

  2. Andy Symes (BirdLife) says:

    Preliminary proposals

    Based on available information, our preliminary proposal for the 2017 Red List would be to adopt the proposed classification outlined in the initial forum discussion.

    There is now a period for further comments until the final deadline of 4 August, after which the recommended categorisations will be put forward to IUCN.

    Please note that we will then only post final recommended categorisations on forum discussions where these differ from those in the initial proposal.

    The final 2017 Red List categories will be published on the BirdLife and IUCN websites in early December, following further checking of information relevant to the assessments by both BirdLife and IUCN.

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