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    American Coot Life History

    Habitat

    Habitat Lakes and PondsThe American Coot inhabits a wide variety of freshwater wetlands from prairie potholes to swamps and marshes to suburban park and sewage ponds to the edges of large lakes. Two features generally characterize all bodies of water where coots breed: (1) heavy stands of emergent aquatic vegetation along at least some portion of the shoreline and (2) at least some depth of standing water within those stands of vegetation. Seasonal wetlands used during years of high water, while drought years cause breeding to be limited to permanent wetlands.Back to top

    Food

    Food PlantsEats mainly aquatic plants including algae, duckweed, eelgrass, wild rice, sedges, hydrilla, wild celery, waterlilies, cattails, water milfoil; when on land they also pick at terrestrial plants and sometimes eat grains or leaves of oak, elm, and cypress trees. They’re not exclusively vegetarian. You may also see them eating insects (beetles, dragonflies, and others), crustaceans, snails, and small vertebrates such as tadpoles and salamanders.Back to top

    Nesting

    Nest Placement

    Nest FloatingNests are almost always built over water on floating platforms and almost always associated with dense stands of living or dead vegetation such as reeds, cattails, bulrushes, sedges, and grasses. Occasionally, the nest may be built on the edge of a stand of vegetation, where it is clearly visible.

    Nest Description

    The nest material is woven into a shallow basket with a hollowed interior lined with finer smooth material to hold the eggs. The entire nest is generally a floating structure anchored to upright stalks. Average diameter is 12 inches, with a 12 to 15-inch ramp and an egg cup of about 1 inch in depth and 6 inches in diameter.

    Nesting Facts
    Clutch Size:8-12 eggs
    Number of Broods:1-2 broods
    Egg Length:1.7-2.2 in (4.3-5.5 cm)
    Egg Width:0.8-1.5 in (2-3.7 cm)
    Incubation Period:23-25 days
    Egg Description:Buff, pinkish buff or buff-gray speckled with dark brown, purplish brown, or black.
    Condition at Hatching:Covered in down, alert, ready to leave the nest within 6 hours of hatching.
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    Behavior

    Behavior Surface DiveA slow and meticulous forager, the American Coot plucks at plants while walking, swimming, dabbling with its head just underwater, or in full dives. In flight coots are clumsy and labored (though less so than Common Moorhens). To get airborne, coots typically have to beat their wings while running across the water for many yards. Coots sometimes gather in winter flocks of several thousand, sometimes mixing with other waterfowl. They sometimes steal food from others including ducks. Coots sometimes lay their eggs in the nests of other coots as well as Franklin’s Gulls, Cinnamon Teal, and Redheads. Back to top

    Conservation

    Conservation Low ConcernAmerican Coot are common and widespread, and populations appear to be stable, according to the North American Breeding Bird Survey. They are not on the 2014 State of the Birds Watch List. Coot aren’t hunted nearly as much as ducks since many hunters consider them inedible. Some hunters shoot them for sport, particularly in Louisiana, California, Florida, Wisconsin, and Minnesota. In 1999 the annual harvest of coots in the U.S. was about 720,000. Because they live in wetlands, coots can accumulate toxins from pollution sources including agricultural runoff, industrial waste, and nuclear facilities. Because coots are so common and widespread, scientists sometimes monitor them as a way of monitoring these problems in the environment at large.Back to top

    Credits

    Brisbin Jr., I. Lehr and Thomas B. Mowbray. 2002. American Coot (Fulica americana), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.

    Dunne, Pete. 2006. Pete Dunne's essential field guide companion: Houghton Mifflin Harcourt.

    Ehrlich, P. R., D. S. Dobkin and D. Wheye. 1988. The birder's handbook. A Field Guide to the natural history of North American birds, including all species that regularly breed north of Mexico. New York: Simon and Schuster, Inc.

    Lutmerding, J. A. and A. S. Love. Longevity records of North American birds. Version 2015.2. Patuxent Wildlife Research Center, Bird Banding Laboratory 2015.

    North American Bird Conservation Initiative. 2014. The State of the Birds 2014 Report. US Department of Interior, Washington, DC, USA.

    Sauer, J. R., J. E. Hines, J. E. Fallon, K. L. Pardieck, Jr. Ziolkowski, D. J. and W. A. Link. The North American Breeding Bird Survey, results and analysis 1966-2013 (Version 1.30.15). USGS Patuxtent Wildlife Research Center 2014b. Available from http://www.mbr-pwrc.usgs.gov/bbs/.

    Sibley, David Allen. 2014. The Sibley guide to birds, second edition. Alfred A Knopf, New York.

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