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A number of unique trees in the pinyon-juniper forests of El Malpais National Monument in New Mexico have been stolen, prompting the National Park Service to ask for information that could lead to the arrest of the thieves.

More than 40 bison have been removed this fall from the North Rim of Grand Canyon National Park, where the size of the resident herd has been growing uncontrolled.

This National Parks Quiz and Trivia #41 features eleven national parks established over the years during the month of October.