Animalia > Chordata > Aves > Anseriformes > Anatidae > Anas > Anas laysanensisAnas laysanensis (Laysan Duck)The Laysan duck (Anas laysanensis), also known as the Laysan teal, is a dabbling duck endemic to the Hawaiian Islands. Fossil evidence reveals that Laysan ducks once lived across the entire archipelago, but today survive only on Laysan Island. The duck has evolved several behavioral traits linked to the absence of ground-based predators in its habitat; these include freezing or running to escape danger rather than flying, which made the duck vulnerable to hunting by humans, and the pigs, rats and mongooses they brought with them to Hawaii. By 1860, the ducks had disappeared from everywhere except Laysan Island. The introduction of rabbits brought the bird to the brink of extinction in 1912 with twelve surviving individuals. Rabbits were eradicated from the island in 1923 and numbers of Lay |
Uniqueness Scale: Similiar (0) Unique (100) Uniqueness & Vulnerability Scale: Similiar & Secure (0) Unique & Vulnerable (100) ED Score: 1.36035 EDGE Score: 3.6314 |
| Clutch Size [3] | 3.8 | | Clutches / Year [3] | 1 | | Fledging [2] | 56 days | | Incubation [3] | 28 days | | Maximum Longevity [3] | 12 years | | Snout to Vent Length [2] | 23 inches (58 cm) | | Water Biome [1] | Coastal |  | | Adult Weight [2] | 2.465 lbs (1.118 kg) | | Birth Weight [3] | 26 grams | | | Diet [4] | Carnivore (Invertebrates), Carnivore (Vertebrates), Piscivore, Granivore, Herbivore | | Diet - Ectothermic [4] | 10 % | | Diet - Fish [4] | 10 % | | Diet - Invertibrates [4] | 40 % | | Diet - Plants [4] | 20 % | | Diet - Seeds [4] | 20 % | | Forages - Ground [4] | 20 % | | Forages - Water Surface [4] | 60 % | | Forages - Underwater [4] | 20 % | | | Female Maturity [3] | 1 year | | Male Maturity [3] | 1 year |
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| Name |
Countries |
Ecozone |
Biome |
Species |
Report |
Climate |
Land
Use |
|
Northwestern Hawaii scrub |
United States |
Oceania |
Tropical and Subtropical Grasslands, Savannas, and Shrublands |
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 |
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| Name |
Location |
Endemic |
Species |
Website |
|
Polynesia-Micronesia |
Fiji, Micronesia, Polynesia, Samoa, Tonga, United States |
Yes |
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Attributes / relations provided by ♦ 1Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at animaldiversity.org♦ 2Nathan P. Myhrvold, Elita Baldridge, Benjamin Chan, Dhileep Sivam, Daniel L. Freeman, and S. K. Morgan Ernest. 2015. An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles. Ecology 96:3109 ♦ 3de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774 ♦ 4Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027 ♦ 5DIET COMPOSITION AND TERRESTRIAL PREY SELECTION OF THE LAYSAN TEAL ON LAYSAN ISLAND, MICHELLE H. REYNOLDS, JOHN W. SLOTTERBACK, AND JEFFREY R. WALTERS, Atoll Research Bulletin 543, National Museum of Natural History, Smithsonian Institute, Proceedings of the Northwestern Hawaiian Islands third Scientific Symposium, pp. 181-199 (2006) Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 Wildfinder Database |
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0
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