Population information

Order name Ciconiiformes
Family name Threskiornithidae
Scientific name Plegadis falcinellus Common name Glossy Ibis
Population name Philippines, Indonesia and Australia
Breeding range Australia (not Tasmania), New Guinea, Philippines, Indonesia Non-breeding range
Red List Category Least Concern
Ramsar regions Asia Oceania
Notes Marchant & Higgins (1990) considers this species to be monotypic. Populations of Philippines, Indonesia and Australia have been separated as race peregrinus, but recent studies show that differences are not significant.

Conservation Framework

Conservation framework Notes
No conservation frameworks

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 1 1987 1991 25,000 1,000,000 No quality assessment [R519]
WPE 2 1987 1991 25,000 1,000,000 No quality assessment [R519]
WPE 3 1987 1991 25,000 1,000,000 No quality assessment [R519]
WPE 4 2003 2003 100,000 1,000,000 No quality assessment [S4211] [R341]
WPE 5 1995 2009 25,000 1,000,000 Best guess [S7862] [R286] [R341] [R1112] [R1149] [R1150]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 1 0 0 Unknown No quality assessment
WPE 2 0 0 Unknown No quality assessment
WPE 3 0 0 Unknown No quality assessment
WPE 4 0 0 Unknown No quality assessment
WPE 5 1982 2011 DEC? No idea [T5505] [R1113] [R1023] [R1022]

Population 1% level

Publication Yearset 1 percent Note
WPE 1 -1 -1 Not Set
WPE 2 -1 -1 Not Set
WPE 3 -1 -1 Not Set
WPE 4 2006 10000
WPE 5 2012 10000


  • R519 - Perennou, C.P., Mundkur, T. and Scott, D.A. 1994. The Asian Waterfowl Census 1987-1991: distribution and status of Asian waterfowl. IWRB Spec. Publ. No. 24; AWB Spec. Publ. No. 86. Slimbridge, UK and Kuala Lumpur, Malaysia.
  • 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,
  • R286 - Halse, S.A., Pearson, G.B., Jaensch, R.P., Kulmoi, P., Gregory, P., Kay, W.R. and Storey, A.W. 1996. Waterbird surveys of the Middle Fly River floodplain, Papua New Guinea. Wildlife Research 23 (5): 557-569. (CSIRO Publishing, Australia).
  • R1112 - Kingsford, R.T., Porter, J.L. and Halse, S.A. 2012. National waterbird assessment. Waterlines report, National Water Commission, Canberra. Available online at http://nwc.gov.au/publications/waterlines/74
  • 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
  • R1113 - Kingsford, R.T. and Johnson, W. 1998. Impact of water diversions on colonially-nesting waterbirds in the Macquarie Marshes of arid Australia. Colonial Waterbirds 21: 159-170.
  • R1023 - BirdLife International. 2012i. Important Bird Areas factsheet: Narran Wetlands. Downloaded from?http://www.birdlife.org?on 30/04/2012
  • R1022 - BirdLife International. 2012h. Important Bird Areas factsheet: Gwydir Wetlands. Downloaded from?http://www.birdlife.org?on 30/04/2012


  • S4211 - 344: Estimate for Australia D and trend FLU. 289: Large numbers [60,000] estimated southern New Guinea but not known if were migrants from Australia. 415: not apparently numerous in Philippines or Indonesia.
  • S7862 - Estimate is based on past and recent estimates in Australia combined with estimates from New Guinea and allowing for assumed numbers in SE Asia; migratory status within range is not clear.
  • T5505 - Trend is possible long-term decline due to impacts of river regulation and irrigation on viability of some breeding colonies (others, including some large colonies, are intact).

Copyright Wetlands International 2012

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