|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Butchart, S., Ekstrom, J., Khwaja, N.
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be fluctuating, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
|Previously published Red List assessments:|
- 2012 – Least Concern (LC)
- 2009 – Least Concern (LC)
- 2008 – Least Concern (LC)
- 2004 – Least Concern (LC)
- 2000 – Lower Risk/least concern (LR/lc)
- 1994 – Lower Risk/least concern (LR/lc)
- 1988 – Lower Risk/least concern (LR/lc)
|Range Description:||Nycticorax caledonicus occurs in the Philippines, Indonesia, Australia, Papua New Guinea, the Solomon Islands, Palau, New Caledonia (to France) and the Caroline Islands, Federated States of Micronesia. The subspecies crassirostris, which was endemic to Japan's Bonin Islands, has been extinct since the late 1800s (del Hoyo et al. 1992).|
Australia; Brunei Darussalam; Christmas Island; Cocos (Keeling) Islands; Indonesia; Malaysia; Micronesia, Federated States of ; New Caledonia; Northern Mariana Islands; Palau; Papua New Guinea; Philippines; Solomon Islands; Timor-Leste
|♦ Continuing decline in area of occupancy (AOO):||Unknown|
|♦ Extreme fluctuations in area of occupancy (AOO):||No||♦ Estimated extent of occurrence (EOO) - km2:||31600000|
|♦ Continuing decline in extent of occurrence (EOO):||Unknown||♦ Extreme fluctuations in extent of occurrence (EOO):||No|
|♦ Continuing decline in number of locations:||Unknown|
|♦ Extreme fluctuations in the number of locations:||No|
|♦ Upper elevation limit (metres):||1600|
|Range Map:||Click here to open the map viewer and explore range.|