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Straw-necked Ibis Threskiornis spinicollis
BirdLife is updating this factsheet for the 2016 Red List
Please email us with any relevant information

IUCN Red List history

Year Category
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern

Species attributes

Migratory status full migrant Forest dependency Low
Land mass type   Average mass -


  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 6,390,000
Extent of Occurrence non-breeding (km2) 6,560,000
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals poor Estimated 2009
Population trend Stable -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 10.1 - - -
Population justification: The population is estimated to number 1,000,000 individuals.
Trend justification: The overall population trend is fluctuating, although some populations are stable and others have unknown trends (Wetlands International 2006).

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Australia Native Extant Yes      
Indonesia Native Extant        
Norfolk Island (to Australia) Vagrant Extant        
Papua New Guinea Native Extant        

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Australia Alligator Rivers Floodplains site factsheet
Australia Arafura Swamp site factsheet
Australia Broad Sound site factsheet
Australia Cooper Floodplain Below Windorah site factsheet
Australia Diamantina and Astrebla Grasslands site factsheet
Australia Fortescue Marshes site factsheet
Australia Gwydir Wetlands site factsheet
Australia Hunter Estuary site factsheet
Australia Lake Corangamite Complex site factsheet
Australia Lake Machattie Area site factsheet
Australia Lake Sylvester System site factsheet
Australia Lowbidgee Floodplain site factsheet
Australia Macquarie Marshes site factsheet
Australia Mandora Marsh and Anna Plains site factsheet
Australia Narran Wetlands site factsheet
Australia North Victorian Wetlands site factsheet
Australia Swan Bay and Port Phillip Bay Islands site factsheet
Australia Tarrabool Lake-Eva Downs Swamp System site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Aquatic & Marine Irrigated Land (includes irrigation channels) suitable breeding
Artificial/Aquatic & Marine Irrigated Land (includes irrigation channels) suitable non-breeding
Artificial/Terrestrial Arable Land suitable breeding
Artificial/Terrestrial Arable Land suitable non-breeding
Artificial/Terrestrial Pastureland suitable breeding
Artificial/Terrestrial Pastureland suitable non-breeding
Forest Subtropical/Tropical Dry suitable breeding
Forest Subtropical/Tropical Dry suitable non-breeding
Grassland Temperate suitable breeding
Grassland Temperate suitable non-breeding
Altitude 0 - 0 m Occasional altitudinal limits  


Purpose Primary form used Life stage used Source Scale Level Timing
Pets Whole Adults and juveniles Wild International Non-trivial Recent

Recommended citation
BirdLife International (2016) Species factsheet: Threskiornis spinicollis. Downloaded from on 24/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 24/10/2016.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Threskiornithidae (Ibises, Spoonbills)
Species name author (Jameson, 1835)
Population size mature individuals
Population trend Stable
Distribution size (breeding/resident) 6,390,000 km2
Country endemic? No
Links to further information
- Summary information on this species