Expansion of nature tourism markets may be limited because of restrictions on visitor numbers at specific sites. Hence, factors affecting visitor expenditures are critical. This study of nature tourists in Arizona indicates that bird-watchers spend more money than other visitors to natural sites. Communities that target nature visitors from areas more than a few hours' drive away and encourage visits to multiple sites can increase visitor expenditures.
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Leones et al. (1998) studied this question.
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