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Large numbers may stop to feed along barrier islands, at whale carcasses, and at dumps during fall movements (Johnson and Herter 1989).","animalPhenologyComments":null,"colonialBreeder":true,"length":69,"width":null,"weight":1576,"animalPhenologies":[{"animalCagPhenologyId":101440,"animalPhenology":{"id":3,"animalPhenologyDescEn":"Diurnal","animalPhenologyDescEs":"Diurno","animalPhenologyDescFr":"Diurne","displayOrder":3},"adult":true,"immature":true}],"animalFoodHabits":[{"animalCagFoodHabitsId":102729,"foodHabits":{"id":1,"foodHabitsDescEn":"Carnivore","foodHabitsDescEs":"Carnívoro","foodHabitsDescFr":"Carnivore","displayOrder":1},"adult":true,"immature":true},{"animalCagFoodHabitsId":102730,"foodHabits":{"id":2,"foodHabitsDescEn":"Piscivore","foodHabitsDescEs":"Piscivore","foodHabitsDescFr":"Piscivore","displayOrder":2},"adult":true,"immature":true},{"animalCagFoodHabitsId":102731,"foodHabits":{"id":3,"foodHabitsDescEn":"Invertivore","foodHabitsDescEs":"Invertívoro","foodHabitsDescFr":"Invertivore","displayOrder":3},"adult":true,"immature":true}]},"occurrenceDelineations":[{"eoSpecsDetailId":1045,"locationUseClass":{"id":2,"locationUseClassDescEn":"Breeding","locationUseClassDescEs":"En reproducción","locationUseClassDescFr":"Reproduction","displayOrder":2},"eoSpecGroupName":"Colonial Seabirds","subtypes":"Breeding Colony, Foraging Area","inferredExtentDistance":2.0,"inferredExtentNotes":"Somewhat arbitrary, but generally very conservative for this group, many members of which travel long distances to foraging grounds.","minimumEoCriteria":"Evidence of historical breeding , or current and likely recurring breeding, at a given location, minimally a reliable observation of one or more breeding pairs in appropriate habitat. Be cautious about creating EOs for observations that may represent single breeding events outside the normal breeding distribution.","mappingGuidance":"Map foraging areas as separate polygons if they are separated from the breeding colony by areas simply flown over on commuting routes.","separationBarriers":"None.","separationDistanceUnsuitableHabitatat":5.0,"separationDistanceSuitableHabitatat":5.0,"altSeparationProcedure":"Where colonies are closer than 5 kilometers, separate occurrences may be created if research shows little genetic mixing between colonies.","separationJustification":"Occurrences include nesting and foraging areas, but occurrence separations are based on nesting areas (i.e., distance between nesting areas, regardless of foraging locations). Hence, different occurrences may overlap.<br><br>Occurrences are not based on discrete populations or metapopulations. Instead, the separation distance is arbitrarily small such that occurrences are of of practical size for data management purposes. <br><br>Evidence from a number of species of seabirds indicates that even though the 'home ranges' of individual nesting seabirds may be immense when foraging trips are taken into account, little movement or feeding overlap may occur between nearby colonies. For example, Thick-billed Murres may commute up to 170 kilometers one way on a feeding trip from the colony, but birds from a colony only 8 kilometers away may forage in a completely different direction; even birds from different sub-colonies only 1.5 kilometers apart mostly fed in completely separate areas (Gaston and Hipfner 2000).  <br><br>Most seabirds have strong breeding site fidelity; e.g., Thick-billed Murres (Gaston and Hipfner 2000, Gaston et al. 1994), Gray-backed Tern (Mostello et al. 2000), Red-footed Booby (Schreiber et al. 1996).","versionDate":"2004-10-20","versionAuthor":"Cannings, S., and G. Hammerson","versionNotes":null,"lastModified":"2020-04-30T02:04:14.425472Z"},{"eoSpecsDetailId":1046,"locationUseClass":{"id":3,"locationUseClassDescEn":"Nonbreeding","locationUseClassDescEs":"No reproducción","locationUseClassDescFr":"Non-reproduction","displayOrder":3},"eoSpecGroupName":"Colonial Seabirds","subtypes":"Feeding area, Loafing site, Roosting site","inferredExtentDistance":null,"inferredExtentNotes":null,"minimumEoCriteria":"Evidence of recurring presence of flocks of nonbreeding birds (including historical), including nonbreeding birds within the breeding season and breeding individuals outside the breeding season; and potential recurring presence at a given location. Normally only areas where concentrations greater than 25 birds regularly occur for more than 20 days per year would be deemed EOs; the number of individuals may be reduced for very rare species. Be cautious about creating EOs for observations that may represent single events.","mappingGuidance":null,"separationBarriers":"None.","separationDistanceUnsuitableHabitatat":10.0,"separationDistanceSuitableHabitatat":10.0,"altSeparationProcedure":null,"separationJustification":"Separation distance arbitrary; defined this small to aid in conservation planning. Sites more than 10 kilometers apart may be joined as one occurrence if research shows that predominantly the same individuals are using both sites.","versionDate":"2001-03-07","versionAuthor":"Cannings, S.","versionNotes":null,"lastModified":"2020-04-30T02:04:14.425472Z"}],"plantCharacteristics":null,"elementManagement":{"elementGlobalId":101458,"eoManagementGroupName":null,"stewardshipOverview":null,"impacts":null,"restorationPotential":null,"siteConservationPlansConsidered":null,"managementMethods":null,"monitoringMethods":null,"managementProgramContacts":null,"monitoringProgramContacts":null,"managementResearchPrograms":null,"managementResearchNeeds":null,"biologicalResearchNeeds":null,"additionalTopics":null},"occurrenceViabilities":[{"eoRankSpecsDetailId":103003,"eoRankSpecsGroupName":null,"locationUseClass":{"id":1,"locationUseClassDescEn":"Not applicable","locationUseClassDescEs":"No se aplica","locationUseClassDescFr":"Sans objet","displayOrder":1},"excellentViability":null,"goodViability":null,"fairViability":null,"poorViability":null,"viabilityJustification":"Use the Generic Guidelines for the Application of Occurrence Ranks (2008).<br>The Key for Ranking Species Occurrences Using the Generic Approach provides a step-wise process for implementing this method.","versionDate":null,"versionAuthor":null,"versionNotes":null,"lastModified":"2020-05-14T02:19:04.159362Z"}],"references":[{"id":153779,"citation":"American Ornithologists' Union (AOU). 1983. 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BirdLife International, Cambridge, UK.","shortCitationAuthor":"BirdLife International","shortCitationYear":2004,"referenceCode":"N04BIR0100LA","lastModified":"2020-02-25T14:38:12.704742Z"},{"id":104085,"citation":"Evans, P. G. H. 1984a. The seabirds of Greenland: their status and conservation. Pages 49-84 in Croxall et al., eds. Status and conservation of the world's seabirds. ICBP Tech. Pub. No. 2.","shortCitationAuthor":"Evans","shortCitationYear":1984,"referenceCode":"A84EVA01NAUS","lastModified":"2020-02-25T14:38:21.111106Z"},{"id":127893,"citation":"Evans, P. G. H. 1984b. Status and conservation of seabirds in northwest Europe (excluding Norways and the USSR). Pages 293-321 in Croxall et al., eds. Status and conservation of the world's seabirds. ICBP Tech. Pub. No. 2.","shortCitationAuthor":"Evans","shortCitationYear":1984,"referenceCode":"A84EVA02NAUS","lastModified":"2020-02-25T14:38:21.111106Z"},{"id":131193,"citation":"Gaston, A. J., and J. M. Hipfner. 2000. Thick-billed Murre (<i>Uria lomvia</i>). No. 497 IN A. Poole and F. Gill, editors, The birds of North America. The Birds of North America, Inc., Philadelphia, PA. 32pp.","shortCitationAuthor":"Gaston and Hipfner","shortCitationYear":2000,"referenceCode":"A00GAS01NACA","lastModified":"2020-02-25T18:11:59.475593Z"},{"id":108160,"citation":"Gaston, A. J., et al. 1994. Population parameters of thick-billed murres at Coats Island, Northwest Territories, Canada. Condor 96:935-948.","shortCitationAuthor":"Gaston et al.","shortCitationYear":1994,"referenceCode":"A94GAS01NAUS","lastModified":"2020-02-25T18:11:59.475593Z"},{"id":103790,"citation":"Godfrey, W.E. 1966. The birds of Canada. National Museums of Canada. Ottawa. 428 pp.","shortCitationAuthor":"Godfrey","shortCitationYear":1966,"referenceCode":"B66GOD01NAUS","lastModified":"2020-02-25T14:38:14.361032Z"},{"id":147495,"citation":"Golovkin, A. N. 1984. Seabirds nesting in the USSR: the status and protection of populations. Pages 473-486 in Croxall et al., eds. Status and conservation of the world's seabirds. ICBP Tech. Pub. No. 2.","shortCitationAuthor":"Golovkin","shortCitationYear":1984,"referenceCode":"A84GOL03NAUS","lastModified":"2020-02-25T18:11:59.475593Z"},{"id":100210,"citation":"Harrison, C. 1978. A Field Guide to the Nests, Eggs and Nestlings of North American Birds. Collins, Cleveland, Ohio.","shortCitationAuthor":"Harrison","shortCitationYear":1978,"referenceCode":"B78HAR01NAUS","lastModified":"2020-02-25T14:38:12.657866Z"},{"id":155592,"citation":"Howell, S. N. G., and S. Webb. 1995.  A guide to the birds of Mexico and northern Central America. Oxford University Press, Oxford, UK.","shortCitationAuthor":"Howell and Webb","shortCitationYear":1995,"referenceCode":"B95HOW01NAUS","lastModified":"2020-02-25T14:38:14.376662Z"},{"id":116541,"citation":"Johnson, S. R. and D. R. Herter. 1989. The Birds of the Beaufort Sea. BP Exploration (Alaska) Inc., Anchorage, Alaska. 372 pp.","shortCitationAuthor":"Johnson and Herter","shortCitationYear":1989,"referenceCode":"B89JOH01NAUS","lastModified":"2020-02-25T14:38:18.8767Z"},{"id":152222,"citation":"Lensink, C. J. 1984. The status and conservation of seabirds in Alaska. Pages 13-27 in Croxall et al., eds. Status and conservation of the world's seabirds. ICBP Tech. Publ. No. 2.","shortCitationAuthor":"Lensink","shortCitationYear":1984,"referenceCode":"A84LEN01NAUS","lastModified":"2020-02-25T18:11:59.491215Z"},{"id":107285,"citation":"Mostello, C. S., N. A. Palaia, and R. B. Clapp. 2000. Gray-backed Tern (Sterna lunata). No. 525 in A. Poole and F. Gill (editors). The birds of North America. The Birds of North America, Inc., Philadelphia, PA. 28 pp.","shortCitationAuthor":"Mostello et al.","shortCitationYear":2000,"referenceCode":"A00MOS01NACA","lastModified":"2020-02-25T18:11:59.491215Z"},{"id":158423,"citation":"Parker III, T. A., D. F. Stotz, and J. W. 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Check-list of North American birds. Seventh edition. American Ornithologists' Union, Washington, D.C. [as modified by subsequent supplements and corrections published in <i>The Auk</i>]. 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