People's culinary tastes can change -- which in the past has proven to be detrimental at times. History shows that a species can literally be eaten to commercial extinction such as the Canvasback duck, or contribute to complete population demise as in the case of the Passenger Pigeon, whose numbers declined from over 3 billion to 0 in less than 50 years. It is shown in marine populations as well, such as abalone, a shellfish that became wildly popular with Americans after 1915 but was harvested to near extinction in California waters, says a Texas A&M University at Galveston professor who studies the effects of consumer demand on living resources.

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