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Oceanodroma hornbyi

Ringed Storm-Petrel

  • Order: Procellariiformes
  • Family: Hydrobatidae
  • Monotypic

Authors: Drucker, Jacob, and Alvaro Jaramillo

Oceanodroma hornbyi

off shore from Pucusana, Lima, Peru; 7 December 2012 © Tom Johnson

Ringed, or Hornby’s, Storm-Petrel is endemic to the Humboldt Current zone. Its breeding colonies have not been discovered yet, this being among the most confounding of mysteries of South American seabirds. Juveniles have been found well inland in the lights of mines and other inhabited areas of the Peruvian and Chilean desert, and so it currently is thought that this seabird may nest well inland, not unlike Gray Gull (Leucophaeus modestus). Interestingly it shares a largely gray plumage with the gull, perhaps an adaptation to desert nesting? Offshore this storm-petrel is found farther out, in deeper water than other sympatric storm-petrels, making it more difficult to find than its relatives. Ringed Storm-Petrel also is one of the most boldly marked and distinctive small seabirds in the world, having white underparts, a dark breast band, gray upperparts and a dark hood.

Recommended Citation

Drucker, Jacob, and Alvaro Jaramillo. 2013. Ringed Storm-Petrel (Oceanodroma hornbyi), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology; retrieved from Neotropical Birds Online:

This map is based on the maps available from the NatureServe InfoNatura website. The data for these maps are provided by NatureServe in collaboration with Robert Ridgely, James Zook, The Nature Conservancy - Migratory Bird Program, Conservation International - CABS, World Wildlife Fund - US, and Environment Canada - WILDSPACE.

  • Migration/Movement:Intratropical Migrant
  • Primary Habitat:Pelagic waters
  • Foraging Strata:Water (surface)
  • Foraging Behavior:---
  • Diet:Fish
  • Sociality:Single-Species Flocks
  • Mating System:Unknown
  • Nest Form:Undescribed
  • Clutch: -
  • IUCN Status:Data Deficient