| Kingdom | Phylum | Class | Order | Family |
|---|---|---|---|---|
| Animalia | Chordata | Aves | Charadriiformes | Laridae |
| Scientific Name: | Creagrus furcatus (Néboux, 1842) | |||
Common Name(s):
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| Taxonomic Source(s): | AOU. 1998. Check-list of North American birds. American Ornithologists' Union, Washington, D.C. | |||
| Red List Category & Criteria: | Least Concern ver 3.1 |
| Year Published: | 2016 |
| Date Assessed: | 2016-10-01 |
| Assessor(s): | BirdLife International |
| Reviewer(s): | Butchart, S. & Symes, A. |
| Facilitator/Compiler(s): | Butchart, S., Calvert, R. & Ekstrom, J. |
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Justification: This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds under the population trend criterion (>30% decline over ten years or three generations). The population size may be moderately small to large, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern. |
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| Previously published Red List assessments: |
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| Range Description: | The Swallow-tailed Gull breeds mainly on the Galapagos Islands, Ecuador (all major and several minor islands) but also on Malpelo Island, Colombia. When not breeding it can be found along the Pacific coast of South American from Ecuador to northern Chile1. | ||||||||||||||
| Countries occurrence: | Native: Chile; Colombia; Costa Rica; Ecuador; PeruVagrant: Panama | ||||||||||||||
| Additional data: |
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| Range Map: | Click here to open the map viewer and explore range. |
| Current Population Trend: |  Unknown | ||||||||||||
| Additional data: |
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| Habitat and Ecology: | This species feeds mostly at night but also by day, heavily exploiting squid at night but also taking clupeid fish. It appears to suffer from periodic food shortages, and is often observed feeding 500 km from the nearest land. It breeds throughout the year and asynchronously across the Galapagos, with individual subcolonials being synchronised by social interactions. It forms loose colonies with large inter-nest distances but can be solitary, nesting on steep slopes or broken cliffs, often on broad clifftop ledges but also just above the wave line, and on gravelly beaches and under vegetation. Adults leave the colony after breeding and become highly pelagic, returning in 4-5 months often to their previous nest site. |
| Systems: | Terrestrial; Marine |
| Continuing decline in area, extent and/or quality of habitat: | Unknown |
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| Generation Length (years): | 17.4 |
| Movement patterns: | Full Migrant |
| Congregatory: | Congregatory (and dispersive) |
| Citation: | BirdLife International. 2016. Creagrus furcatus. The IUCN Red List of Threatened Species 2016: e.T22694493A95219692. . Downloaded on 18 June 2018. |
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ISSN 2307-8235
