Quick Answer
Identifying teal species in the field requires attention to plumage, bill shape, and size, as well as noting the presence of distinctive markings such as green stripes on the forehead or a white forehead patch. Teal species also exhibit distinct flight patterns and habits. Experience and familiarity with the species are essential for accurate identification.
Field Identification Characteristics
When identifying teal species in Louisiana’s marshes, look for the presence of green stripes on the forehead. The Blue-winged Teal has a distinctive green stripe extending from the beak to the eye, while the Green-winged Teal has a more subtle green stripe on the forehead that may be difficult to see. Measure the length of the bill to distinguish between the two species: Blue-winged Teal bills are typically 0.75 to 1 inch long, while Green-winged Teal bills are usually 0.5 to 0.75 inches long.
Size and Plumage
Blue-winged Teal are generally smaller than Green-winged Teal, with a length of 16 to 20 inches and a weight of 7 to 10 ounces. Green-winged Teal are 18 to 24 inches long and weigh 10 to 14 ounces. Note the color and pattern of the plumage, including the presence of white cheek patches and the extent of green on the head and neck. Blue-winged Teal have a more pronounced white cheek patch and a smaller green area on the head.
Flight Pattern and Habitat
Observe the teal’s flight pattern and habitat to aid in identification. Blue-winged Teal are more likely to be found in shallow water and are known for their rapid, direct flight, often flying low to the water. Green-winged Teal prefer deeper water and have a more erratic flight pattern, often flying in a zigzag pattern.
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