Population information

Order name Ciconiiformes
Family name Ardeidae
Scientific name Nycticorax caledonicus Common name Rufous Night-heron
Population name hilli
Breeding range Java, New Guinea, Australia (vagrant Tasmania) Non-breeding range
Red List Category Least Concern
Ramsar regions Oceania

Conservation Framework

Conservation framework Notes
No conservation frameworks

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 4 2003 2003 100,000 1,000,000 [S3914] [R341]
WPE 1 0 0 -1 -1
WPE 2 0 0 -1 -1
WPE 3 0 0 -1 -1
WPE 5 2004 2011 25,000 1,000,000 Best guess [S7743] [R341] [R1101] [R1149] [R1150]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 4 1990 2000 FLU [R341]
WPE 1 0 0 Unknown
WPE 2 0 0 Unknown
WPE 3 0 0 Unknown
WPE 5 1982 2011 FLU Poor [T5674] [R1101] [R341]

Population 1% level

Publication Yearset 1 percent Note
WPE 4 2006 10000
WPE 1 0 -1
WPE 2 0 -1
WPE 3 0 -1
WPE 5 2012 10000


  • R341 - Jaensch, Roger, August 2005. Detailed data and notes on numbers and distribution of waterbirds in Australia, updated from Jaensch, 2003, and derived from more than 90 Australian sources including Wetlands International, Birds Australia and Jaensch, 2003,
  • R1101 - Jaensch, R. April 2012. Detailed data and notes on numbers and trends of waterbirds in Australia and other parts of the Oceania region, in a spreadsheet prepared for Wetlands International - Oceania for the 5th edition of WPE.
  • R1149 - Reid, J.R.W., Kingsford, R.T. and Jaensch, R.P. 2009. Waterbird Surveys in the Channel Country Floodplain Wetlands, Autumn 2009. Report by Australian National University, Canberra, University of New South Wales, Sydney, and Wetlands International, Oceania, Brisbane, for the Australian Government Department of Environment, Water, Heritage and the Arts. 81 pp. Also available online at http://www.lebmf.gov.au/publications/pubs/waterbirds-report.pdf
  • R1150 - Reid, J. and Jaensch, R. 2004. Aerial waterbird survey results. Section 4.7, pp 472-493 in, Costelloe, J.F., Hudson, P.J., Pritchard, J.C., Puckridge, J.T. and Reid, J.R.W. AridFlo Scientific Report: Environmental Flow Requirements of Arid Zone Rivers with Particular Reference to the Lake Eyre Drainage Basin. School of Earth and Environmental Sciences, University of Adelaide, Adelaide. Final Report to DLW and BC and DEH. Also available online at http://www.lebmf.gov.au/publications/aridflo.html


  • S3914 - 344: Estimate in Australia 100,000 - 1,000,000, trend FLU, but available information suggests that population towards lower end of range, and that 100,000 - 1,000,000, also appropriate for entire population. "Locally common New Guinea"; scarce Java (180). 289: Large numbers [9000] estimated southern New Guinea but not known if were migrants from Australia.
  • S7743 - Estimate based on numbers in colonies and consideration of survey difficulties and numbers outside Australia.
  • T5674 - Trend is fluctuating; possible long-term decline due to loss of some breeding habitat in E Australia requires confirmation.

Copyright Wetlands International 2012

Citation: Wetlands International (). "Waterbird Population Estimates" . Retrieved from wpe.wetlands.org on