Oceanodroma tethys
Silhouette: Richard Crossley · PhyloPic
In 3 days ~20% in a week ~40%
The wedge-rumped storm petrel (Hydrobates tethys) is a storm petrel. It breeds in the Galápagos Islands and on the coast of Peru. It was formerly defined in the genus Oceanodroma before that genus was synonymized with Hydrobates.
Wedge-rumped storm-petrel [Oceanodroma tethys] - photos, Christopher Taylor Nature Photography Wikipedia →
Recording
© Fabrice Schmitt · XCXC871491 · CC BY-NC-SA 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Galápagos Islands | 🇪🇨 Ecuador | |
| 2 | Isla del Coco National Park | 🇨🇷 Costa Rica | |
| 3 | Coiba National Park | 🇵🇦 Panama | |
| 4 | Cabo Blanco Absolute Nature Reserve | 🇨🇷 Costa Rica | |
| 5 | Cabo Pulmo National Park | 🇲🇽 Mexico | |
| 6 | Machalilla National Park | 🇪🇨 Ecuador | |
| 7 | Corcovado National Park | 🇨🇷 Costa Rica | |
| 8 | Manuel Antonio National Park | 🇨🇷 Costa Rica |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Los Angeles | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Wedge-rumped Storm-Petrel sighting in Cabo Blanco Absolute Nature Reserve on a given day, based on 99 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 99th most-seen of the 241 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
May and August
In those months about 30% of wildlife watchers report a Wedge-rumped Storm-Petrel in Cabo Blanco Absolute Nature Reserve on a given day, against under 5% in February–April and October–December, the lowest months. Those are among Cabo Blanco Absolute Nature Reserve's wettest months, with about 470 mm of rain a month against 15 mm in February.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Wedge-rumped Storm-Petrel sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 8
Of the 8 parks where we can rate Wedge-rumped Storm-Petrel sightings, Cabo Blanco Absolute Nature Reserve ranks 4th at about 10%. The best odds are in Galápagos Islands (Ecuador, about 20%), Isla del Coco National Park (Costa Rica, about 10%) and Coiba National Park (Panama, about 10%).
GBIF citizen-science records
It is estimated from how often the Wedge-rumped Storm-Petrel is recorded against all the birds logged in Cabo Blanco Absolute Nature Reserve (99 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
