Why Storm-Petrels Deserve Your Attention
Storm-petrels are the smallest seabirds on Earth. Most weigh less than a robin. They spend nearly their entire lives over open ocean, pattering across the surface on spindly legs as they pick tiny crustaceans and fish from the water. Sailors called them “petrels” after St. Peter walking on water.
There are roughly 28 species split across two families that aren’t closely related. The Northern Storm-Petrels (Hydrobatidae) breed mainly in the Northern Hemisphere, while the Southern Storm-Petrels (Oceanitidae) centre their diversity around the Southern Ocean. The two families diverged around 30 million years ago; their similarities are convergent evolution rather than shared ancestry.
For pelagic birders, storm-petrels present a genuine challenge. They’re small, fast, and often appear in mixed flocks where telling species apart requires sharp eyes. Here’s where to see storm-petrels on pelagic trips around the world.
Wilson’s Storm-Petrel: The Most Abundant Seabird
Wilson’s Storm-Petrel (Oceanites oceanicus) is a strong candidate for the most abundant wild bird on the planet, with a global population estimated at 8 to 20 million individuals. It breeds on Antarctica and subantarctic islands during the austral summer, then migrates north in vast numbers. By June through September, Wilson’s Storm-Petrels swarm across the North Atlantic, where they’re the default storm-petrel on most East Coast pelagic trips.
The Hatteras Offshore Pelagic out of North Carolina regularly encounters Wilson’s Storm-Petrels from May through October, often in flocks of dozens trailing the boat’s chum slick. The BBC Overnight Pelagic from Hyannis, Massachusetts, produces them reliably on summer trips to the continental shelf edge. Across the Atlantic, the Isles of Scilly Pelagic in England encounters Wilson’s alongside European Storm-Petrels from August through October. In the Southern Hemisphere, Cape Town pelagic trips see Wilson’s year-round in the Benguela upwelling.
Look for dark plumage, a white rump patch, and long legs that extend past the tail in flight.
Band-rumped Storm-Petrel: Gulf Stream Specialist
The Band-rumped Storm-Petrel (Hydrobates castro) is one of the most sought-after storm-petrels in North America. In the western Atlantic, the Gulf Stream waters off Cape Hatteras are the most reliable spot to find them, with birds present from late May through mid-August. The Hatteras Offshore Pelagic encounters Band-rumped Storm-Petrels regularly once the boat reaches the Gulf Stream wall, typically 20 to 25 miles from Hatteras Inlet.
Band-rumped Storm-Petrels also breed in the Azores, Madeira, Cape Verde, and on islands off Hawaii and Japan. Taxonomists are actively splitting the complex; several populations may represent distinct species with different breeding seasons on the same islands. In the Gulf of Mexico, the Gulf Eagle Offshore Pelagic from Port Aransas, Texas, records them in deep Gulf waters.
Separating Band-rumped from Wilson’s takes practice. Band-rumped has a shearwater-like flight with stiff wingbeats and long glides; Wilson’s is more fluttery. Band-rumped’s legs don’t project past the tail.
Leach’s Storm-Petrel: North Atlantic and Pacific Breeder
Leach’s Storm-Petrel (Hydrobates leucorhous) breeds on remote islands across the northern Atlantic and Pacific. In the Atlantic, colonies stretch from Massachusetts north to Newfoundland, Iceland, and Scotland. In the Pacific, they breed from Baja California to the Aleutian Islands. It’s a widespread species but one that can be tricky to see, as it tends to forage farther offshore than other storm-petrels and is less attracted to chum slicks.
The BBC Overnight Pelagic from Massachusetts encounters Leach’s Storm-Petrels at the continental shelf canyons, where they mix with Wilson’s. On the Pacific side, trips out of Monterey Bay and Westport, Washington, pick up Leach’s regularly in late summer and autumn. The Oregon Pelagic Tours from Newport also records them over the productive shelf waters.
Leach’s is larger than Wilson’s with a bounding, nighthawk-like flight and a white rump patch divided by a grey central line.
Ashy Storm-Petrel: California’s Endangered Endemic
The Ashy Storm-Petrel (Hydrobates homochroa) has one of the most restricted ranges of any seabird. It breeds only on islands off the California coast, from the Farallon Islands near San Francisco south to the Coronado Islands off northern Baja California. The entire global population is roughly 10,000 birds. The IUCN listed it as Endangered in 2018, with introduced predators and light pollution at colonies among the primary threats.
Monterey Bay Pelagic trips are the best bet for seeing Ashy Storm-Petrels. The cold upwelling waters of Monterey Canyon concentrate them close to their breeding islands, and trips from late summer through autumn offer the best chances. The San Diego Offshore Pelagic also records Ashy Storm-Petrels, though less frequently.
Ashy Storm-Petrels are entirely dark grey-brown with no white rump patch, making them easy to confuse with the similar Black Storm-Petrel at a distance. They’re smaller and more fluttery in flight.
Black-bellied Storm-Petrel: Southern Ocean Wanderer
The Black-bellied Storm-Petrel (Fregetta tropica) breeds on subantarctic islands from the South Shetlands to Kerguelen, South Georgia, and New Zealand’s outlying islands. After breeding, it migrates north into tropical and subtropical seas.
In South Africa, the Bustards Birding Durban Pelagic from KwaZulu-Natal is one of the more reliable trips for this species, particularly during spring when birds pass through on their way south.
Black-bellied Storm-Petrels have a characteristic black line running down the centre of their white belly, visible when they bounce across the waves in their splashy, chest-hitting feeding style.
White-faced Storm-Petrel: The Bouncing Petrel
The White-faced Storm-Petrel (Pelagodroma marina) is unmistakable, with a striking white face and dark eye patch. It feeds by bouncing off the water surface with both feet, springing forward in long, kangaroo-like hops.
New Zealand holds the largest populations, with at least a million breeding pairs on islands from the Three Kings south to the Chathams. The Hauraki Gulf Pelagic and Tutukaka Pelagic from New Zealand’s North Island are excellent for this species from August through April. In Australia, the Sydney Pelagic from Wollongong regularly encounters White-faced Storm-Petrels in the East Australian Current waters.
White-faced Storm-Petrels also breed in the North Atlantic (Canary Islands, Selvagens, Cape Verde) and occasionally appear off the US East Coast, though sightings there are rare.
European Storm-Petrel: The Original “Stormy Petrel”
The European Storm-Petrel (Hydrobates pelagicus) is the species that gave the whole group its name. It breeds on rat-free islands along Europe’s Atlantic coast, with the largest colonies in the Faroe Islands, UK, Ireland, and Iceland.
The Isles of Scilly Pelagic is one of the best trips for seeing European Storm-Petrels, particularly from August through October. Chumming in the deep waters beyond the archipelago draws them in alongside Wilson’s Storm-Petrels, creating excellent comparison opportunities. On the European mainland, the Sagres Pelagic in Portugal’s Algarve encounters both European and Wilson’s Storm-Petrels during autumn.
European Storm-Petrels are tiny, even by storm-petrel standards. They have a distinctive white rump band, a square tail, and a fluttery, bat-like flight low over the waves.
Other Notable Species
Several other storm-petrel species are accessible on pelagic trips listed in our directory:
- New Zealand Storm-Petrel: Rediscovered in 2003 after being thought extinct, this species is now seen regularly on the Tutukaka Pelagic and Hauraki Gulf Pelagic in New Zealand.
- Pincoya Storm-Petrel: One of the world’s most recently described seabirds, found only in the fjords of southern Chile. The Quest for Pincoya Storm-Petrel from Puerto Montt is the dedicated trip for this species.
- Tristram’s and Matsudaira’s Storm-Petrels: Both can be seen on the Tokyo-Ogasawara Ferry crossing in Japan.
- Elliot’s Storm-Petrel: A Humboldt Current species encountered on Galapagos cruises.
ID Tips for Storm-Petrels at Sea
Storm-petrel identification is difficult. The birds are small, often distant, and ocean lighting changes constantly. A few things help:
Watch the flight style. This matters more than plumage details at distance. Wilson’s flutters and patters. Band-rumped glides on stiff wings like a small shearwater. Leach’s bounds with deep, erratic wingbeats. White-faced bounces off the water in long hops.
Check the rump. Most storm-petrels have a white rump patch, but its shape varies. Wilson’s has a wide, wrapping rump band. Leach’s has a divided rump. Ashy has no white at all.
Note the leg projection. Wilson’s Storm-Petrel’s long legs extend well past the tail. Band-rumped’s don’t. This single feature separates the two most common Gulf Stream storm-petrels.
Photograph everything. Even blurry shots can capture diagnostic features you missed in the field.
Conservation Challenges
Storm-petrels nest in burrows on remote islands, making them vulnerable to introduced rats, cats, and mice that raid nests and kill adults. Light pollution disorients fledglings, drawing them inland where they crash-land. The Ashy Storm-Petrel’s tiny population sits on a handful of California islands. Leach’s Storm-Petrel has declined sharply at some Atlantic colonies. Supporting pelagic trips that contribute to seabird research and monitoring helps; several operators in our directory work with scientists to collect data during trips.
Find Storm-Petrel Trips
Browse our trip directory to find pelagic trips in storm-petrel hotspots, or explore by region: United States, New Zealand, South Africa, or United Kingdom.