Anas creccacommon teal(Also: common teal;green-winged teal)

Geographic Range

Green-winged Teals breed throughout most of Canada, Alaska, Maine, N. Dakota, Minnesota, and Northern Michigan. Their wintering range includes the western United States, Mexico, and the southern United States. Two other subspecies of the Teal, A. c. crecca and A. c. nimia, can be found in Eurasia and the Aleutian Islands.

Habitat

Teals prefer shallow inland wetlands, beaver ponds, and coastal marshes with heavy vegetation and muddy bottoms. These habitats are often found in deciduous parklands, boreal forests, grasslands, or sedge meadows.

  • Aquatic Biomes
  • lakes and ponds

Physical Description

The Teal is the smallest dabbling duck in the Americas. Its bill is narrow and black. Teals are sexually dimorphic. Males have a cinnamon colored head with an iridescent green crescent spanning from one eye, around the back of the head, to the other eye. The sides and back are actually marked with tiny black and white stripes, although they appear grey. Their wings and tail are a tannish-brown color, with pale yellow feathers along the side of the tail. Females are entirely tannish-brown, except for their white chin and belly.

  • Range mass
    318 to 364 g
    11.21 to 12.83 oz
  • Average basal metabolic rate
    1.68388 W
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Reproduction

Green-winged Teals begin courtship between September and November. They form monogamous pairs every winter. Paired males attempt forced extra-pair copulation during the mating season, while nonpaired males do not. The nest is built by the female, while the male watches, at the beginning of the egg-laying period. This occurs sometime in May, depending on the weather and temperature. Five or 6 eggs are usually layed. The male then abandons the female, who must incubate and care for the young alone. Incubation lasts for about 23 days, during which time the female spends almost three-fourths of her time on the nest, while the rest is spent in feeding and comfort movements. Once hatched, the Teal ducklings are more sensitive to cold than other duck species, and the mother must protect them from extreme cold through brooding. She also leads them to water and food and protects them from predators by using techniques of distraction.

  • Range eggs per season
    5 to 6
  • Average eggs per season
    10
    AnAge
  • Average time to hatching
    23 days
  • Average time to hatching
    22 days
    AnAge
  • Average age at sexual or reproductive maturity (female)
    Sex: female
    180 days
    AnAge
  • Average age at sexual or reproductive maturity (male)
    Sex: male
    180 days
    AnAge

Lifespan/Longevity

Behavior

Teals are rapid, agile flyers. They are the only duck known to scratch while in flight. They do not dive for food, but have been seen diving to escape predators. Males exhibit distinctive whistles, while females typically vocalize through a series of quacks.

The sleeping and preening behaviors of the Teal strongly resemble other duck species. For example, they sleep standing up with their bill turned into their back feathers. The preen by shaking, stretching, and nibbling. They are not known to exhibit territoriality.

Communication and Perception

Food Habits

Green-winged Teals feed on almost any plant or animal in high abundance, largely in shallow waters, near the shoreline or in mudflats. Their main foods vary from region to region, depending on what is available, but they consist mainly of marine invertebrates and seeds of marine vegetation. The finely spaced lamallae along the inside of the Teal's bill allow it to retrieve small seeds easily.

Economic Importance for Humans: Positive

Green-winged Teals are hunted for sport. In 1989, approximately 200,000 were harvested in Canada alone.

Conservation Status

Green-winged Teals are the second most commonly hunted duck in North America, following Mallards. In addition, there has been a decline in their wintering habitat. In spite of these two setbacks, however, Teal populations are increasing. This is likely due to the inaccessibility to humans of their breeding habitat, which is deep in the wilderness of northern Canada. The wetlands that they inhabit in the winter are being managed, but more for waterfowl in general than for the Green-winged Teal.

Other Comments

Green-winged Teals migrate in large groups of up to a few hundred ducks. They move mainly at night.

Contributors

Jennifer Roof (author), University of Michigan-Ann Arbor.

Glossary

Nearctic

living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.

World Map

acoustic

uses sound to communicate

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.

chemical

uses smells or other chemicals to communicate

endothermic

animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.

forest

forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.

iteroparous

offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).

migratory

makes seasonal movements between breeding and wintering grounds

motile

having the capacity to move from one place to another.

native range

the area in which the animal is naturally found, the region in which it is endemic.

oviparous

reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.

sexual

reproduction that includes combining the genetic contribution of two individuals, a male and a female

social

associates with others of its species; forms social groups.

tactile

uses touch to communicate

tropical savanna and grassland

A terrestrial biome. Savannas are grasslands with scattered individual trees that do not form a closed canopy. Extensive savannas are found in parts of subtropical and tropical Africa and South America, and in Australia.

savanna

A grassland with scattered trees or scattered clumps of trees, a type of community intermediate between grassland and forest. See also Tropical savanna and grassland biome.

temperate grassland

A terrestrial biome found in temperate latitudes (>23.5° N or S latitude). Vegetation is made up mostly of grasses, the height and species diversity of which depend largely on the amount of moisture available. Fire and grazing are important in the long-term maintenance of grasslands.

visual

uses sight to communicate

References

Johnson, Kevin. The Birds of North America. No. 193, 1995. The American Ornithologists' Union.