Animalia > Chordata > Aves > Anseriformes > Anatidae > Anas > Anas strepera

Anas strepera (Gadwall)

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Wikipedia Abstract

The gadwall (Anas strepera) is one of the most common and widespread dabbling ducks in the family Anatidae. It usually frequents Wetlands and dabbles for food.
View Wikipedia Record: Anas strepera


Anas strepera couesi (Coue's gadwall)
Anas strepera strepera (Common gadwall)

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 2.49941
EDGE Score: 1.25259


Adult Weight [1]  2.022 lbs (917 g)
Birth Weight [3]  36 grams
Female Weight [1]  1.909 lbs (866 g)
Male Weight [1]  2.134 lbs (968 g)
Weight Dimorphism [1]  11.8 %
Breeding Habitat [2]  Prairie wetlands, Freshwater marshes
Wintering Geography [2]  Widespread U.S./Mexico
Wintering Habitat [2]  Wetlands
Diet [4]  Granivore, Herbivore
Diet - Plants [4]  70 %
Diet - Seeds [4]  30 %
Forages - Ground [4]  20 %
Forages - Water Surface [4]  80 %
Female Maturity [3]  8 months
Male Maturity [3]  8 months
Clutch Size [5]  10
Clutches / Year [3]  1
Global Population (2017 est.) [2]  3,100,000
Incubation [3]  26 days
Maximum Longevity [3]  22 years
Wing Span [6]  35 inches (.9 m)


Protected Areas

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Important Bird Areas

Biodiversity Hotspots

Prey / Diet



Institutions (Zoos, etc.)

Range Map


North America; Oceania; Western Michigan University’s Asylum Lake;

External References



Attributes / relations provided by
1Leschack, CR, SK Mcknight, and GR Hepp. 1997. Gadwall (Anas strepera). In The Birds of North America, no. 283 (A. Poole and F. Gill, Eds.). Academy of Natural Sciences, Philadelphia, and American Ornithologists' Union, Washington, DC
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
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
5Jetz W, Sekercioglu CH, Böhning-Gaese K (2008) The Worldwide Variation in Avian Clutch Size across Species and Space PLoS Biol 6(12): e303. doi:10.1371/journal.pbio.0060303
6British Trust for Ornithology
7Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
8Feeding ecology of North American gopher snakes (Pituophis catenifer, Colubridae), JAVIER A. RODRÍGUEZ-ROBLES, Biological Journal of the Linnean Society, 2002, 77, 165–183
9Spermophilus franklinii, Andrea C. Ostroff and Elmer J. Finck, MAMMALIAN SPECIES No. 724, pp. 1–5 (2003)
10Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 WWF WildFINDER
Protected Areas provided by Biological Inventories of the World's Protected Areas in cooperation between the Information Center for the Environment at the University of California, Davis and numerous collaborators.
Natura 2000, UK data: © Crown copyright and database right [2010] All rights reserved. Ordnance Survey Licence number 100017955
GBIF Global Biodiversity Information Facility
Biodiversity Hotspots provided by Critical Ecosystem Partnership Fund
Abstract provided by DBpedia licensed under a Creative Commons License