Leach´s Storm Petrel

Leach´s Storm Petrel, Vaal Stormvogeltje, Wellenläufer, Painho de cauda forcada, Paiño Boreal

Spotted near Sines in the Alentejo region of Portugal.                                                         Leach´s Storm Petrel sound

The Leach’s Storm Petrel or Leach’s Petrel (Oceanodroma leucorhoa) is a small seabird of the tubenose family. It is named after the British zoologist William Elford Leach.

It breeds on inaccessible islands in the colder northern areas of the Atlantic and Pacific. It nests in colonies close to the sea in well concealed areas such as rock crevices, shallow burrows or even logs. It lays a single white egg which often has a faint ring of spots at the large end. This storm petrel is strictly nocturnal at the breeding sites to avoid predation by gulls and skuas, and will even avoid coming to land on clear moonlit nights. The largest colony of Leach’s Storm Petrels can be found on Baccalieu Island of eastern Canada, an ecological reserve with more than 3 million pairs of the bird.

The Leach’s Petrel, known in some rural areas as Carrie Chicks, is a small bird at 18–21 cm in length with a 43–48 cm wingspan. Like many other Storm-petrels, it has all-dark plumage and usually a white rump. However, dark-rumped individuals exist on the west coast of North America; they are very rare north of southern California, but the percentage increases suddenly on the United States-Mexico border where 90-100% of breeding birds are dark-rumped. In Europe, it can be readily distinguished from the European Storm Petrel and the Wilson’s Storm Petrel by its larger size, forked tail, different rump pattern and flight behavior. Identification in the Americas, however, proves more difficult. On the Atlantic Coast it is very hard to separate this species from Band-rumped Storm Petrels; identification involves characteristics such as the extent of white on the rump and flight pattern. Discerning this species from others is arguably hardest on the Pacific Coast, where the dark-rumped from can be confused with at least three other all-dark Storm-petrel species. Here, identification involves close attention to wingbeats and overall color. It has a fluttering flight, and patters on the water as it picks planktonic food items from the ocean surface. Like most petrels, its walking ability is limited to a short shuffle to the burrow.

Contrary to most species, these birds gain telomere length as they age. Telomere shortening in cell division limits the maximum lifespan of most other species. The lifespan of the Leach’s Petrel is therefore theoretically limitless. This is a matter of debate, however. Studies have shown that while the telomere growth may have contributed to the eldest of specimens, young specimens exhibit telomeres that are longer, and shorten over time. The Leach’s Petrel lifespan may be inconclusive, but there is no data to support the hypothesis that this species is possibly immortal.

It is strictly pelagic outside the breeding season, and this, together with its remote breeding sites, makes Leach’s Petrel a difficult bird to see from land. Only in storms might this species be pushed into headlands. Unlike Storm-petrel, it does not follow ships. In Europe, the best chance of seeing this species is in September in Liverpool Bay between north Wales and England. Strong north-westerlies funnel migrating Leach’s Petrels into this bay. British ornithologists Robert Atkinson and John Ainslie observed the communities of Leach’s Petrel on the remote Scottish islands of North Rona between the 16 July and 12 August 1936, and on Sula Sgeir between the 3 and 4 August 1939.

Lifespan for this bird is unusually long for a bird of such rather small size, with an average of 20 years and a maximum recorded lifespan of 36 years. In 2003, Haussmann et al. found that the bird’s telomeres lengthen with age, the only known example to date of such a phenomenon. It is rather likely, however, that this phenomenon also occurs in other members of the Procellariiformes, which all have a rather long lifespan compared to their size.

They feed primarily on plankton, including euphausiids, copeopods, and a form of amphipod that are parasitic to jellyfish gonadal pouches. They also feed to a large extent on myctophids (lantern fish) which only occur at the surface at night in water over the continental slope. Individuals have been observed to feed at distances up to 300 km from any known breeding colony. Breeding individuals store energy rich lipids in a sac anterior to their stomach which are used to either sustain themselves while incubating their single egg, to feed their chick, or can also be used as a defensive mechanism when caught by a predator as do many other Procellariformes. There is evidence showing that parents feed their chicks different prey species than they consume themselves. Parent birds also accidentally feed their chicks plastic debris which they mistake for food items floating on the surface of the ocean. Chicks grow to a prefledging weight almost double of that when they actually fledge from the burrow in late September. Fall storms can cause these young fledging individuals to wreck on the mainland.

Other synonyms:

Afrikaans: Swaelstertstormswael
Asturian: Paín de Leach, Paín Rauforcau
Breton: Ar satanig bras
Catalan: Noneta grossa, Petrell cuaforcat
Catalan (Balears): Noneta grossa
Czech: Burnácek belavý
Welsh: Brochellog pedryn llach, Pedryn cynffon-fforchog, Pedryn Gynffon-fforchog, Pedryn llach
Danish: Stor stormsvale
German: Wellenlaufer, Wellenläufer
English: Beal’s Petrel, Chapman Petrel, Dusky-rumped Petrel, Fork-tailed Storm-petrel, Kaeding’s Petrel, Leach’s Fork-tailed Storm-Petrel, Leach’s Petrel, Leach’s Storm Petrel, Leach’s Stormpetrel, Leach’s Storm-Petrel, Socorro Petrel
Esperanto: Forkvosta petrelo
Spanish: Lavapiés, Paíño Añapero, Paiño boreal, Paíño Boreal, Paino de Leach, Paiño De Leach, Paíño de Leach, Pamperito de Rabo Horquillado, Petrel de las Tormentas de Leach
Spanish (Argentine): Paiño boreal
Spanish (Costa Rica): Paiño de leach
Spanish (Dominican Rep.): Lavapiés
Spanish (Honduras): Paino de Leach
Spanish (Mexico): Paiño de leach, paíño de Leach
Spanish (Nicaragua): Paíño Añapero
Spanish (Uruguay): Paiño de Leach, Petrel de las Tormentas de Leach
Spanish (Venezuela): Golondrina de Mar
Estonian: Põhja-tormipääsu
Basque: Ekaitz-txori handia, Petrell cuaforcat
Finnish: Myrskykeiju
Faroese: SýlðI drunnhvíti, Sýldur drunnhvíti
French: Océanite culblanc, Océanite cul-blanc, Pétrel culblanc, Pétrel cul-blanc
Irish: Guairdeall Gabhlach
Gaelic: Gobhlan Mara
Galician: Paíño de rabo gallado, Petrell cuaforcat
Haitian Creole French: Oseanit dèyè blanch
Hungarian: Villás viharfecske
Icelandic: Sjósvala
Italian: Uccello d. t. codaforcuta, Uccello delle tempeste codaforcuta
Japanese: koshijiroumitsubame, Koshijiro-umitsubame
Latin: Hydrobates leucorhoa, Oceanodroma leucorhoa, Oceanodroma leucorhoa leucorhoa
Lithuanian: Šiaurinis audrašauklis, Skeltauodegis petrelis
Dutch: Vaal Stormvogeltje, Vaalstormvogeltje
Norwegian: Stormsvale
Polish: nawalnik duzy
Portuguese: andorinha-das-tormentas, andorinha-do-mar, andorinhão-das-tormentas, paínho de cauda turcada, Painho-de-cauda-forcada, Paínho-de-cauda-forcada, painho-de-cauda-furcada, tapereira
Portuguese (Brazil): andorinha-das-tormentas, andorinha-do-mar, andorinhão-das-tormentas, painho-de-cauda-forcada, Painho-de-cauda-furcada, tapereira
Romansh: ravarel d’undas
Northern Sami: Stoarbmaspálfu
Slovenian: viharni strakoš
Swedish: Klykstjärtad stormsvala

Travel Birdwatching Holiday Alentejo, Vacation Portugal for birders to see birds on your trip.