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Movements And Asynchronous Nesting Of The Peruvian Tern Sternula Lorata In Chile And Peru, Thomas P. Ryan, Bárbara Olmedo Barrera, Sylvia Hernández Aquez, Michael T. Hallworth
Movements And Asynchronous Nesting Of The Peruvian Tern Sternula Lorata In Chile And Peru, Thomas P. Ryan, Bárbara Olmedo Barrera, Sylvia Hernández Aquez, Michael T. Hallworth
Marine Ornithology
The Peruvian Tern Sternula lorata is an endangered seabird that nests asynchronously in different parts of its nesting range from northern Chile to Ecuador. Asynchronous nesting raises the possibility of counting individuals more than once during annual population censuses. We deployed 10 light-level archival tags (geolocators) to terns at the nesting ground in Mejillones, Chile, at the southern end of this species’ range during 06–11 September 2015, and we retrieved three the following year at the same location. Results showed that the tagged birds remained at the nesting grounds in Mejillones from July to December then migrated north, some in …
Seabird Abundance And Distribution Off Western Iberian Waters Estimated Through Aerial Surveys, Hélder Araújo, Pedro Correia-Rodrigues, Jorge Bastos-Santos, Marisa Ferreira, Andreia T. Pereira, Jose Martinez-Cedeira, José Vingada, Catarina Eira
Seabird Abundance And Distribution Off Western Iberian Waters Estimated Through Aerial Surveys, Hélder Araújo, Pedro Correia-Rodrigues, Jorge Bastos-Santos, Marisa Ferreira, Andreia T. Pereira, Jose Martinez-Cedeira, José Vingada, Catarina Eira
Marine Ornithology
Western Iberian waters are important migratory flyways, stopover sites, and wintering areas for several of the world’s seabird species. To describe seabird species composition, distribution, and abundance in these waters, we performed six aerial surveys in September and/ or October of each year, 2010–2015, covering 74 840 km2. Using line-transect methodology, 27 396 seabird sightings from 17 taxonomic groups were recorded along 10496.3 nautical miles (19 433 km). Using the program “Distance,” annual and overall abundance estimates were obtained for nine taxonomic groups: Balearic Shearwater Puffinus mauretanicus, Great Shearwater Ardenna gravis, Cory’s Shearwater Calonectris borealis, shearwaters, Northern Gannet Morus bassanus, …
The Tropicbirds Phaethon Spp. Of The Islas Desventuradas Archipelago, Chile, Manuel Marín, Rodrigo González
The Tropicbirds Phaethon Spp. Of The Islas Desventuradas Archipelago, Chile, Manuel Marín, Rodrigo González
Marine Ornithology
We found nesting Red-billed and Red-tailed tropicbirds Phaethon aethereus and P. rubricauda in the Islas Desventuradas archipelago, Chile. We visited Islote González on 14–15 December 2020 and on 23 August 2021. During the December visit, we encountered a colony of Red-billed Tropicbirds totaling a minimum of 62 breeding pairs. The nests were in cavities on steep cliffs and slopes located mainly on the northern part of the island, and we were able to access 34, of which 11 had eggs, 11 had nestlings of different ages, and 12 were active but empty. During the August visit, we found four nests …
Albatross And Petrel Interactions With An Artisanal Squid Fishery In Southern Peru During El Niño, 2015-2017, Cristian Moreno, Javier Quiñones
Albatross And Petrel Interactions With An Artisanal Squid Fishery In Southern Peru During El Niño, 2015-2017, Cristian Moreno, Javier Quiñones
Marine Ornithology
We report on the occurrence of albatrosses (Diomedeidae) and petrels (Procellariidae) associated with an artisanal small-scale fishery (SSF) for Humboldt Squid Dosidicus gigas in waters of southern Peru during El Niño 2015–2016 and coastal El Niño 2017. We deployed as observers on a number of fishing trips to assess seabird interactions. White-chinned Petrels Procellaria aequinoctialis and Waved Albatross Phoebastria irroata were the most abundant species observed, followed by Salvin’s Thalassarche salvini and Chatham T. eremita albatross, and Cape Petrels Daption capense. The majority of procellariid species (> 60% of total birds) visited while vessels were positioned over the continental slope. …
Infanticide In Highly Urbanized Colonies Of Black Skimmers Rynchops Niger, Elizabeth A. Forys, Sarah K. Beres, Abigail L. Mckay, Olivia N. Spicer
Infanticide In Highly Urbanized Colonies Of Black Skimmers Rynchops Niger, Elizabeth A. Forys, Sarah K. Beres, Abigail L. Mckay, Olivia N. Spicer
Marine Ornithology
Infanticide, which is the killing of dependent offspring, occurs in many species of colonial seabirds. Most infanticide attempts are made when chicks wander outside their parents’ territories and are more likely to occur when the colony experiences a disturbance or food is limited. Our objective was to determine the rate of infanticide at three Black Skimmer Rynchops niger colonies located on highly urbanized beaches in Pinellas County, Florida, USA. Infanticide occurred 42 times during 3 223 hours of monitoring (0.013 attempts per hour) over four breeding seasons (2018–2021). More than one third of the infanticide attempts occurred after a disturbance, …
Historical Distribution And Current Population Status Of Tufted Puffins Fratercula Cirrhata In Canada's California Current System, Louise K. Blight, Gregory Mcclelland
Historical Distribution And Current Population Status Of Tufted Puffins Fratercula Cirrhata In Canada's California Current System, Louise K. Blight, Gregory Mcclelland
Marine Ornithology
Unpublished accounts indicate that the number of Tufted Puffin Fratercula cirrhata colonies in western Canada has declined in recent decades. However, a lack of recent colony count data makes it impossible to determine current trends. Here we compile published and unpublished information for Tufted Puffins in the Canadian portion of the California Current System (i.e., from the vicinity of the Scott Islands south to the Canada-US border) to update understanding of the species’ status in the region, and to assemble available information in a single source. We found historical records of three additional colonies over those in pre-existing compilations, bringing …
Direct Field Observation Reveals Whiskered Terns Chlidonias Hybrida Preying On Fish Much Larger Than Themselves, Muhammad Iqbal, Deni Mulyana, Pormansyah, Indra Yustian, Arum Setiawan, Hilda Zulkifli
Direct Field Observation Reveals Whiskered Terns Chlidonias Hybrida Preying On Fish Much Larger Than Themselves, Muhammad Iqbal, Deni Mulyana, Pormansyah, Indra Yustian, Arum Setiawan, Hilda Zulkifli
Marine Ornithology
A Whiskered Tern Chlidonias hybrida, consistent with the species’ aggressive nature, was observed to catch and then consume a Great Blue spotted Mudskipper Boleophthalmus pectinirostris in the Nibung River, Banyuasin Peninsula, South Sumatra Province, Indonesia. The fish was ca. 15 cm in length, which was perhaps equal to the tern’s body length and more than double the size of its usual prey. The tern spent over 20 minutes eating the fish. Only direct, field observation would have revealed predation on this fish.
Spatial Effects In Relation To Reproductive Performance Of Common Murres Uria Aalge At A Re-Established Colony, Gerard J. Mcchesney, Julie L. Yee, Michael W. Parker, William M. Perry, Harry R. Carter, Richard T. Golightly, Stephen W. Kress
Spatial Effects In Relation To Reproductive Performance Of Common Murres Uria Aalge At A Re-Established Colony, Gerard J. Mcchesney, Julie L. Yee, Michael W. Parker, William M. Perry, Harry R. Carter, Richard T. Golightly, Stephen W. Kress
Marine Ornithology
A main goal of seabird colony restoration is for the colony to become self-sustaining. To do so, elevated rates must be attained in (1) reproductive success and (2) recruitment by immigrants and birds produced at the colony. Thus, an understanding of the factors affecting reproductive success and recruitment at restoration sites is vital. We examined how spatial features at the colony level affected reproductive success of Common Murres Uria aalge (hereafter, murres) over a six-year period at Devil’s Slide Rock, California, a colony re-established using social attraction techniques. Clusters of sites with similar egg-laying dates, as well as high hatching …
No Evidence Of Avian Malaria In Two Mediterranean Endemic Seabirds, Luca Ilahiane, Federico De Pascalis, Danilo Pisu, David Pala, Federica Ferrario, Marco Cucco, Diego Rubolini, Jacopo G. Cecere, Irene Pellegrino
No Evidence Of Avian Malaria In Two Mediterranean Endemic Seabirds, Luca Ilahiane, Federico De Pascalis, Danilo Pisu, David Pala, Federica Ferrario, Marco Cucco, Diego Rubolini, Jacopo G. Cecere, Irene Pellegrino
Marine Ornithology
In birds, pathogens and diseases—such as avian malaria—can have severe detrimental effects on individual fitness. Pathogen prevalence can vary across species and may differ between populations living in different localities, but screening can aid in our understanding of a disease’s distribution and parasite-host interactions. Although seabirds generally exhibit low avian malaria infection patterns, blood parasites of several species and populations have never been investigated in detail. Using molecular techniques, we screened for blood parasites in two Mediterranean seabirds, the Scopoli’s Shearwater Calonectris diomedea and the Mediterranean Storm Petrel Hydrobates pelagicus melitensis. In addition, we searched for and sampled potential vector …
A Four-Legged African Penguin Spheniscus Demersus Chick, Albert Snyman, David G. Roberts, Katrin Ludynia
A Four-Legged African Penguin Spheniscus Demersus Chick, Albert Snyman, David G. Roberts, Katrin Ludynia
Marine Ornithology
Here we report an African Penguin Spheniscus demersus chick that was removed from Stony Point, South Africa with two supplementary feet; one supplementary foot was located near the cloaca between the left foot and the tail, and the other supplementary foot was situated just behind the left foot.
Albatross Population Monitoring Using Satellite Imagery, A Case Study: Short-Tailed Albatross Phoebastria Albatrus At The Senkaku Islands, Nigel Brothers, Catherine Bone, Alexia Wellbelove
Albatross Population Monitoring Using Satellite Imagery, A Case Study: Short-Tailed Albatross Phoebastria Albatrus At The Senkaku Islands, Nigel Brothers, Catherine Bone, Alexia Wellbelove
Marine Ornithology
Accurate monitoring of vulnerable albatross populations is essential to their conservation. Herein, we explore the prospect of monitoring one particular remote albatross population with a view to promoting accurate worldwide monitoring of vulnerable albatross populations. We used very high-resolution (VHR) satellite images to count nesting Short-tailed Albatrosses Phoebastria albatrus on two islands of the Senkaku group, western North Pacific Ocean, where conventional monitoring has not occurred for 19 years due to a geopolitical territory dispute. Despite count uncertainties across rocky terrain, many birds were clearly discernible using the highest resolution image available of Minami-kojima. The result was a count of …
Winter Colony Attendance By Adult Southern Giant Petrels Macronectes Giganteus: Implications For Rodent Eradications, Peter G. Ryan, Steffen Oppel
Winter Colony Attendance By Adult Southern Giant Petrels Macronectes Giganteus: Implications For Rodent Eradications, Peter G. Ryan, Steffen Oppel
Marine Ornithology
Southern Giant Petrels Macronectes giganteus are partial migrants, but the proportion of adult males and females that visit the colony on Gough Island during winter is poorly defined. A better understanding of winter colony attendance is important to predict the possible impact of non-target mortality during restoration efforts involving poison baiting to eradicate introduced mammals. We repeatedly checked the individual identity of all giant petrels attending the largest breeding colony on Gough Island for rings during April–May 2021. Although the maximum number of individually identifiable ringed adults in a single check was 202, overall, 353 ringed adults were recorded, including …
Masthead, Pacific Seabird Group
Contents, Pacific Seabird Group
Inside Front Cover, Pacific Seabird Group
Front Cover, Pacific Seabird Group
Reviews: Hope Matters: Why Changing The Way We Think Is Critical To Solving The Environmental Crisis (Kelsey, E.); The Gull Next Door: Portrait Of A Misunderstood Bird (Taylor, M.), Rachel T. Buxton, Madeleine Goumas
Reviews: Hope Matters: Why Changing The Way We Think Is Critical To Solving The Environmental Crisis (Kelsey, E.); The Gull Next Door: Portrait Of A Misunderstood Bird (Taylor, M.), Rachel T. Buxton, Madeleine Goumas
Marine Ornithology
No abstract provided.
Author Instructions, Pacific Seabird Group
Sabine's Gulls Xema Sabini Outside Of Their Main Wintering Areas Are Not Necessarily Vagrants, Jonatas H.F. Prado, Gabriel Canani, Pedro V. Castilho, Nicholas W. Daudt
Sabine's Gulls Xema Sabini Outside Of Their Main Wintering Areas Are Not Necessarily Vagrants, Jonatas H.F. Prado, Gabriel Canani, Pedro V. Castilho, Nicholas W. Daudt
Marine Ornithology
We reviewed published and unpublished ‘vagrant’ (herein referred to as ‘unusual’) records of Sabine’s Gull Xema sabini worldwide and discuss these records according to age, marine productivity/fishing grounds, and migration corridors. Of the 151 unusual records, 135 (89%) were in or near areas with high productivity and/or known fishing grounds; 10 out of 14 documented records were young birds in their first or second migration, and the ‘unusual’ areas identified in this study could have been reached through known migration pathways used by other bird species. The fact that the majority of records are associated with productive/fishing zones (and are …
Diagnosis Of Hypothermia In Seabirds From Coastal California, Nancy L. Anderson
Diagnosis Of Hypothermia In Seabirds From Coastal California, Nancy L. Anderson
Marine Ornithology
This study established cloacal temperature (TCl) cut-off values to diagnose hypothermia in near shore seabirds rescued along the coast of California. All birds died when TCl was < 38.2 °C. When Aechmophorus grebes were excluded, 100% died when TCl was < 38.4 °C. Mortality increased 2–3× when TCl was lower than receiver operating curve-determined criteria for diagnosing hypothermia based on attitude: < 38.8 °C for mixed species, < 39.1 °C for Common Murres Uria aalge, and < 38.2 °C for Aechmophorus grebes. Reductions in TCl as small as 1.0 °C had significant physiologic effects.
Trace Elements In Feathers And Eggshells Of Two Tropical Seabirds From Malaysia, Abdulmaula Hamza, Alya Syakirin Hisham, Suhaimi Suratman, Joseph Anak Bidai, Noor Azhar Bin Mohamed Shazili
Trace Elements In Feathers And Eggshells Of Two Tropical Seabirds From Malaysia, Abdulmaula Hamza, Alya Syakirin Hisham, Suhaimi Suratman, Joseph Anak Bidai, Noor Azhar Bin Mohamed Shazili
Marine Ornithology
Seabird feathers and eggshells are used as bio-monitors for trace metal contamination. Eleven trace element concentrations in wing primaries (n = 21) and eggshells (n = 8) are reported herein for two resident seabirds, Bridled Tern Onychoprion anaethetus and Black-naped Tern Sterna sumatrana, at Pulau Ling and Pulau Tokung Burung, Malaysia. Metal concentration followed the pattern Zn > Cr > Mn > Sr > Cu > Se > Ba > Pb > Cd > Ga > Li. Significant positive correlations existed among all trace metals, except for Cr in Black-naped Tern and Li and Cd in Bridled Tern feathers. We also analyzed metal concentrations in eggshells, and for Bridled Tern …
Mercury Contamination In The Endocrine Glands Of Black-Tailed Gulls Larus Crassirostris On Kabushima (Kabu Island), Japan, Yasuaki Niizuma, Hinako Tani, Yuki Yamashita, Mitsuki Ito, Miho Maeda
Mercury Contamination In The Endocrine Glands Of Black-Tailed Gulls Larus Crassirostris On Kabushima (Kabu Island), Japan, Yasuaki Niizuma, Hinako Tani, Yuki Yamashita, Mitsuki Ito, Miho Maeda
Marine Ornithology
A colony of about 30 000 pairs of Black-tailed Gull Larus crassirostris nest on Kabushima (Kabu Island), which is located on the northeast mainland coast of Japan (Sanriku Coast, Honshu Island). There, the surface-water Hg concentration is higher than in the North Pacific Ocean. We collected carcasses from the breeding colony to assess the level of mercury (Hg) contamination. We measured Hg concentrations in 10 body tissues, including the endocrine glands. The relative mercury concentrations in the tissue samples (µg/g dry weight) were as follows: adrenal glands > livers > kidneys > blood > pituitaries > gonads > breast muscles > thyroid glands > pancreases > brain stems. Correlations …
Fishing Gear-Related Injuries And Mortality Of Seabirds In Coastal Northern Argentina, María Paula Berón, Juan Pablo Seco Pon
Fishing Gear-Related Injuries And Mortality Of Seabirds In Coastal Northern Argentina, María Paula Berón, Juan Pablo Seco Pon
Marine Ornithology
Worldwide, many seabirds are killed annually when they become entangled in gear used in coastal fisheries. This includes seabirds along the coast of Argentina, where recreational fishing occurs year-round and where little attention has been paid to the issue. We report here results for a study conducted in the vicinity of Mar del Plata Harbor and Mar Chiquita Lagoon in Buenos Aires Province, Argentina, during the non-breeding season (March–September 2016). We found and inspected 46 individuals of ten species with moderate (30%), severe (46%), and lethal (24%) lesions from fishing gear entanglement. Coastal birds (83%) dominated the tally, with gulls …
Field Separation Of Cory's Calonectris Borealis And Scopoli's C. Diomedea Shearwaters By Underwing Pattern, Robert L. Flood, Ricard Gutiérrez
Field Separation Of Cory's Calonectris Borealis And Scopoli's C. Diomedea Shearwaters By Underwing Pattern, Robert L. Flood, Ricard Gutiérrez
Marine Ornithology
Field separation of Cory’s Calonectris borealis and Scopoli’s C. diomedea shearwaters is notoriously difficult. Past, provisional research found that the most reliable method of separation is by underwing pattern. Here, we present a comprehensive study of the underwing patterns of both species from colonies and other locations in the eastern North Atlantic Ocean (Cory’s Shearwater) and Mediterranean Sea (Scopoli’s Shearwater). Data were derived from museum specimens, typed bycatch victims, and photographs of birds at colony, inshore by colony, and offshore in the Mediterranean. Results demonstrate that the large majority of Cory’s/Scopoli’s shearwaters are separable in the field, though overlapping features …
Threats And Conservation Status Of Common And Roseate Terns Sterna Hirundo/S. Dougallii In The Azores: A Case Study For Terceira Island, Lucas Lamelas-López, Malgorzata Pietrzak, Miguel Ferreira, Veronica C. Neves
Threats And Conservation Status Of Common And Roseate Terns Sterna Hirundo/S. Dougallii In The Azores: A Case Study For Terceira Island, Lucas Lamelas-López, Malgorzata Pietrzak, Miguel Ferreira, Veronica C. Neves
Marine Ornithology
The Azores Archipelago holds the second most important population of Roseate Terns in the North Atlantic. However, the size of the population has been decreasing. In this study, we used remote-sensing cameras and visits to the main colonies of Common Terns Sterna hirundo and Roseate Terns S. dougallii on Terceira Island to identify the causes of breeding failure. Nest depredation by introduced mammals, particularly rats and cats, was the main cause of breeding failure, leading, in some cases, to the complete destruction of the colony. Additional threats included nest disturbance by humans and dogs, which caused the destruction of some …
Using Remote Video Technology To Study Environmental Factors Influencing Productivity Of Black-Legged Kittiwakes Rissa Tridactyla, Sarah A. Tanedo, Tuula E. Hollmén, John M. Maniscalco, Sadie E.G. Ulman
Using Remote Video Technology To Study Environmental Factors Influencing Productivity Of Black-Legged Kittiwakes Rissa Tridactyla, Sarah A. Tanedo, Tuula E. Hollmén, John M. Maniscalco, Sadie E.G. Ulman
Marine Ornithology
Monitoring seabirds and their responses to ecosystem change provides essential information for understanding the reasons behind any changes in productivity or populations. However, many species nest in remote locations, which poses logistical challenges for long-term studies. Remote cameras offer an opportunity to confront this issue. The Black-legged Kittiwake Rissa tridactyla (kittiwake) has been used as an indicator of changes in its environment and is a prime candidate for monitoring via remote cameras. To investigate the potential for camera application, we used a remote camera system to collect six years (2010–2015) of reproductive data from a sub-colony of kittiwakes in Resurrection …
A Test Of Mechanisms Of Population Differentiation In Gannets (Morus Spp.) Using Comparative Phylogeography And Morphometrics, Victoria L. Friesen, Rebecca Brunt, James A. Morris-Pocock, Drew Sauve, Allan J. Baker, Timothy P. Birt, William S. Davidson, Kyle H. Elliott, William A. Montevecchi
A Test Of Mechanisms Of Population Differentiation In Gannets (Morus Spp.) Using Comparative Phylogeography And Morphometrics, Victoria L. Friesen, Rebecca Brunt, James A. Morris-Pocock, Drew Sauve, Allan J. Baker, Timothy P. Birt, William S. Davidson, Kyle H. Elliott, William A. Montevecchi
Marine Ornithology
The relative importance of gene flow, genetic drift, and natural selection in driving genetic divergence of local populations, as well as the factors that disrupt gene flow in natural populations, are uncertain. Comparative analyses enable us to test explicit hypotheses regarding the roles of these factors. Gannets (Morus spp.) include three morphologically and ecologically similar seabird species: the Cape Gannet M. capensis, which breeds in southern Africa; the Australasian Gannet M. serrator, which breeds in southeastern Australia and New Zealand; and the Northern Gannet M. bassanus, which breeds in the North Atlantic. We assessed the extent of differentiation in mitochondrial …
Philopatry, Mate Fidelity, And Nest-Site Fidelity For South Polar Skuas Stercorarius Maccormicki At The Vestfold Hills, East Antarctica, John Van Den Hoff, Kris Carlyon, Louise Emmerson, Clive R. Mcmahon, Gary D. Miller
Philopatry, Mate Fidelity, And Nest-Site Fidelity For South Polar Skuas Stercorarius Maccormicki At The Vestfold Hills, East Antarctica, John Van Den Hoff, Kris Carlyon, Louise Emmerson, Clive R. Mcmahon, Gary D. Miller
Marine Ornithology
Antarctica experiences continual spatial and temporal expansions in human activities, but information to understand how resident species may be impacted is usually inadequate. We analysed resights of South Polar Skuas Stercorarius maccormicki that were individually marked with leg rings during 1999–2004 to compare breeding behaviours such as philopatry, adult mate fidelity, and site fidelity in the Vestfold Hills population, East Antarctica, with other regions. Despite their impressive dispersal capabilities, philopatry for birds resighted in the study area was within 4 km of the natal nest, and adult nest-fidelity was within 1 km of a previous nest site. Such faithfulness to …
Normal Physical Parameters Characterizing Galapagos Marine Birds, Gustavo Jiménez-Uzcátegui, Patricio D. Carrera-Játiva, Soledad Sarzosa, Edison Encalada, Richar Rodríguez-Hidalgo, Erika (Travis) Crook, Christian Sevilla
Normal Physical Parameters Characterizing Galapagos Marine Birds, Gustavo Jiménez-Uzcátegui, Patricio D. Carrera-Játiva, Soledad Sarzosa, Edison Encalada, Richar Rodríguez-Hidalgo, Erika (Travis) Crook, Christian Sevilla
Marine Ornithology
The Galapagos Penguin Spheniscus mendiculus (GAPE), Flightless Cormorant Phalacrocorax harrisi (FLCO), and Waved Albatross Phoebastria irrorata (WAAL) are marine birds that are endemic to the Galapagos Islands. To provide health information for these three species, baseline data on several physiological parameters were collected non-invasively—from individuals and populations appearing to be healthy—during the course of physical examinations that were conducted from 2011–2019. Heart rate, respiratory rate, body temperature, and body condition (weight vs. morphometric measurements) were analyzed as a function of age and sex. Mean heart rate differed significantly between juveniles and adults in all three species. Respiratory rate and body …
On-Land Foraging By Leach's Storm Petrels Oceanodroma Leucorhoa Coincides With Anomalous Weather Conditions, Kyle J.N. D’Entremont, Robert J. Blackmore, Sydney M. Collins, Dave Brown, Ian L. Jones, Bruce Mactavish, Sabina I. Wilhelm, William A. Montevecchi
On-Land Foraging By Leach's Storm Petrels Oceanodroma Leucorhoa Coincides With Anomalous Weather Conditions, Kyle J.N. D’Entremont, Robert J. Blackmore, Sydney M. Collins, Dave Brown, Ian L. Jones, Bruce Mactavish, Sabina I. Wilhelm, William A. Montevecchi
Marine Ornithology
We describe the first known documentation of on-land foraging by Leach’s Storm Petrels Oceanodroma leucorhoa, a behaviour that has been documented only once before among members of the family Hydrobatidae. During a rain/windstorm from 15 to 17 July 2020 in eastern Newfoundland, individuals fed on coastally spawning and beach-cast capelin Mallotus villosus. This behaviour occurred in conjunction with a marine heatwave in the species’ foraging range. Examination showed that wrecked birds were emaciated with negligible stomach contents. This finding, combined with the abnormal weather and foraging behaviour, suggests that these birds were in a weakened state preceding stranding in coastal …