Hydrobates hornbyi


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Hydrobates hornbyi
Species Authority: (G.R. Gray, 1864)
Common Name(s):
English Ringed Storm-petrel, Hornby's Storm Petrel, Ringed Storm-Petrel
Oceanodroma hornbyi (G.R. Gray, 1864)
Taxonomic Notes: Hydrobates hornbyi (del Hoyo and Collar 2014) was previously placed in the genus Oceanodroma.

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Benstead, P., Isherwood, I., Sharpe, C J & Symes, A.
Data on where the species breeds and hence threats and population trends are lacking.

Geographic Range [top]

Range Description: Hydrobates hornbyi has been observed in thousands in the eastern Pacific Ocean, along the coast of Peru and Chile (Carboneras 1992c). Data on overall numbers and trends are lacking, and the breeding grounds have never been found (Carboneras 1992c, Brooke 1999, 2000). At-sea distribution and observations of grounded birds indicate that it nests between 20° and 25°S in Chile and perhaps north into Peru (Brooke 1999). Birds may breed on offshore islands or mainland cliffs, but the coast of north Chile is distinctly bereft of islands and the cliffs are largely devoid of deep rocky crevices or soil in which petrels might burrow (Brooke 1999). It is most likely to nest in the Atacama Desert, and there are reports of mummified adults and fledglings found up to 50 km inland and 1,500 m above sea level (Tobias et al. 2006).

Chile; Peru
Colombia; United States
Present - origin uncertain:
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Brooke (2004) estimated the global population to number at least thousands of individuals (possibly up to tens of thousands of individuals). It is thus estimated to range between 1,000-90,000 individuals, roughly equating to 670-60,000 mature individuals.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: It may breed on offshore islands or mainland cliffs, but is most likely to nest inland in the arid Atacama Desert.

Systems: Terrestrial; Marine

Threats [top]

Major Threat(s): Until the breeding grounds are found, the extent to which it is threatened by mining-related activity will remain unknown (Brooke 1999).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
None is known.

Conservation Actions Proposed
Search for breeding colonies on offshore islands, coastal cliffs and the arid hinterland of the Antofagasta region in March-July, looking for burrows and signs of nesting, listening for night-time flight calls and following up reports of dead or grounded fledglings inland (Tobias et al. 2006).

Citation: BirdLife International 2012. Hydrobates hornbyi. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 29 August 2015.
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