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Rattlesnake round-ups, also known as rattlesnake rodeos are annual events common in the rural Midwest and Southern United States, where the primary attractions are captured wild rattlesnakes which are sold, displayed, killed for food or animal products (such as snakeskin) or released back into the wild. Typically a round-up will also include trade stalls and other features associated with fairs. Rattlesnake round-ups originated in the first half of the 20th century for adventure and excitement, as well as to achieve local extirpation of perceived pest species. Typically a round-up will also include trade stalls, food, rides, and other features associated with fairs, as well as information on rattlesnake biology, identification, and safety. Round-ups take place in at least ten states, with largest events in Texas and Oklahoma. The largest rattlesnake round-up in the United States is held in Sweetwater, Texas. Held every year since 1958, the event currently attracts approximately 30,000 visitors per year and in 2006 each annual Round-Up was said to result in the capture of 1% of the state's rattlesnake population.
Round-ups have economic and social importance to the communities that hold them. The events often attract thousands of tourists, which can bring hundreds of thousands of dollars of revenue into small towns; the Sweetwater Round-Up's economic impact was estimated to exceed US$5 million in 2006. Snake collectors often make large profits selling snakes at the events.
Cash prizes and trophies are often given out to participants in categories like heaviest, longest, or most snakes. These incentives result in all size classes of snakes being targeted equally. Most roundups target the western diamondback rattlesnake (Crotalus atrox), though some events target prairie rattlesnakes (C. viridis), timber rattlesnakes (C. horridus), or the eastern diamondback rattlesnake (C. adamanteus).
A harvest of several hundred to several thousand kilograms of snakes is typical for many roundups. In Texas, up to 125,000 snakes could have been removed annually from the wild during the 1990s. However, effects of roundups on rattlesnake populations are unclear. Harvest size at roundups is highly variable from year to year but does not show a consistent downward trend, even after decades of annual roundup events in some areas. C. atrox is listed as Least Concern by the IUCN. However, poaching and roundups have been destructive to populations of timber rattlesnakes (C. horridus) in the northeastern United States. Some groups are concerned that C. atrox local populations may be declining rapidly, even if the global population is unaffected. Rattlesnake round-ups became a concern by animal welfare groups and conservationists due to claims of animal cruelty and excessive threat of future endangerment. Some Round-Ups responded by imposing catch size restrictions or releasing captured snakes back into the wild.
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