All three are among the smaller grouse, from 40 to 43 cm (16 to 17 in) in length. They are found in North America in different types of prairies. In courtship display on leks, males make hooting sounds and dance with the head extended straight forward, the tail up, and colorful neck sacks inflated (shown in the photograph at upper right). Tympanuchus comes from Ancient Greek roots and means "holding a drum"; it refers to the membranous neck sacks and the drum-like call of the Greater Prairie-chicken.
The two prairie chickens are particularly closely related and look extremely similar.
The extinct Heath Hen of the American east coast, usually considered a subspecies of the Greater Prairie-Chicken, has been considered a separate species.
The Importance of Cultural Ecological Landscapes to the Survival of the Bachman's Warbler (Vermivora Bachmanii) in the Southeastern United States
Jun 22, 2010; This paper speculates about the relationship between the Vermivora bachmanii Audubon (Bach man's Warbler) and canebrakes, an...
Tracking the Long-Term Decline and Recovery of an Isolated Population.(southeastern Illinois greater prairie chickens with habitat in northwestern Minnesota, northeastern Oklahoma and northeastern Colorado; includes bibliographic notes)
Nov 27, 1998; The conservation implications of small population size are controversial (1-4). A significant loss in genetic variation may...