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- Attwater's Prairie Chicken (Tympanuchus cupido attwateri) is a highly endangered subspecies of Greater Prairie Chicken. Over a century ago, one million Attwater's Prairie Chickens graced the Western Gulf coastal grasslands of Texas and Louisiana. Today, less than 1% of their native coastal grassland habitat remains and in 1998 it was estimated that only 260 remained, with less than 60 living in the wild. Their sole refuges in the wild are the Attwater Prairie Chicken National Wildlife Refuge near Eagle Lake, Texas and The Texas City Prairie Preserve that was set aside near Texas City. There is also a small captive breeding colony residing on the grounds of the NASA Lyndon B. Johnson Space Center near Clear Lake, Texas. Captive breeding programs are underway at places such as Fossil Rim Wildlife Center, Texas A&M University, Seaworld of Texas, and the Houston Zoo. The Attwater's Prairie Chicken measures 17-18 inches (43-45.5 cm) and weighs roughly 1.5 to 2 pounds (0.7 to 0.9 kg). It has a 28 inch (70 cm) wingspan. These grouse-like ground birds have strong vertical bars of dark brown and buff-white in a zebralike pattern over the mantle, flanks, and underparts. The species exhibits sexual dimorphism, with the males having elongated feathers, called pinnae, erected to form earlike structures. The male also has as a bright orange to reddish air sac on either side of his neck, which he inflates during mating displays. The mating display can be seen in January or February when the birds gather in small groups on short grass, bare ground, rock outcroppings or hilly areas in order to choose a mate. This area is called a "booming ground" or a "lek". In these areas, the females watch the males and choose their mate. The male emits a booming, "woo-woo" sound from his throat sac and struts around to attract a female. Some of the traditional dances of the North American Plains Indians, notably those of the Lakota, are based on this booming display. Later, the hens build grass nests on the ground, hidden in tall grass, where they lay their eggs. The bird has a diverse diet, eating leaves, seeds, and insects such as grasshoppers. Their predators include Red-tailed Hawks, owls, coyotes, raccoons, skunks, Virginia Opossums, and snakes. Many young birds also die from causes such as flooding. Loss of habitat is believed to be the prime reason for their downfall. There was once 6 million acres (24,000 km²) of coastal grasslands, now there is less than 200,000 acres (800 km²). In addition to loss due to urbanization, the entire grassland ecosystem where they once thrived no longer exists in the same form. Where once grazing Plains Bison and periodic wildfires due to lightning reduced ground cover, the birds now have difficulty making their way through thick undergrowth. It is possible that other less-apparent changes in the ecosystem have had an effect as well. Attwater's Prairie Chicken has been on the endangered species list since March 1967.
- 奧氏角雉（Tympanuchus cupido attwateri），又名草原榛雞阿特沃特亞種，是大草原榛雞高度瀕危的亞種。
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