NT
Beach Thick-knee Esacus magnirostris



Taxonomy

Taxonomic note
Esacus magnirostris (del Hoyo and Collar 2014) was previously listed as E. giganteus; the name magnirostris has priority.

Taxonomic source(s)
Christidis, L. and Boles, W.E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
Christidis, L.; Boles, W. E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Near Threatened C1
2013 Near Threatened C1
2012 Near Threatened C1
2008 Near Threatened C1
2006 Near Threatened
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Land-mass type - continent
Land-mass type - shelf island
Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 29,800,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 4000 medium estimated 2002
Population trend Decreasing suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 10.5 - - -

Population justification: The population is thought to number c.5,000 individuals in Australia, 1,000 individuals in the Melanesian islands (G. Dutson in litt. 2002), and 10-20 individuals in New Caledonia. This totals at least 6,000 individuals, roughly equivalent to 4,000 mature individuals.

Trend justification: The population is suspected to be in decline owing to human disturbance and predation by invasive mammals.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Australia N Extant Yes
Brunei N Extant Yes
India N Extant Yes
Indonesia N Extant Yes
Malaysia N Extant Yes
Myanmar N Extant Yes
New Caledonia (to France) N Extant Yes
Papua New Guinea N Extant Yes
Philippines N Extant Yes
Singapore N Extant Yes
Solomon Islands N Extant Yes
Thailand N Extant Yes
Timor-Leste N Extant Yes
Vanuatu N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Australia Tiwi Islands
Australia Shoalwater Bay (Rockhampton)
Australia Cooloola and Fraser Coast
Australia Repulse Bay to Ince Bay

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Coastal/Supratidal Coastal Brackish/Saline Lagoons/Marine Lakes suitable resident
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands suitable resident
Marine Intertidal Mud Flats and Salt Flats major resident
Marine Intertidal Rocky Shoreline major resident
Marine Intertidal Salt Marshes (Emergent Grasses) suitable resident
Marine Intertidal Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc major resident
Marine Intertidal Shingle and/or Pebble Shoreline and/or Beaches major resident
Marine Intertidal Tidepools major resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Future Unknown Unknown Unknown
Stresses
Species disturbance, Species mortality
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Species disturbance, Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Unspecified species Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Reduced reproductive success, Species mortality

Recommended citation
BirdLife International (2022) Species factsheet: Esacus magnirostris. Downloaded from http://www.birdlife.org on 23/05/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/05/2022.