In 2009 the Grandview Mine in the Grand Canyon National Park had gates added to support on-going bat research, preserve historic mine resources, and promote visitor safety.
Seventeen species of bats live in the Carlsbad Caverns National Park, including a large number of Mexican free-tailed bats.[1] It has been estimated that the population of Mexican free-tailed bats once numbered in the millions but has declined drastically in modern times. The cause of this decline is unknown but the pesticide DDT is often listed as a primary cause.
As of February 2011, at least three states had an official bat. Hawai'i named the Hawaiian hoary bat as the official state land mammal in April 2015.[2] The general assembly of North Carolina considered a bill in 2007 that would have made Rafinesque's big-eared bat as its state bat. The bill passed 92-15, but died in the state senate.[3] In 2020, the big brown bat was designated the official state mammal of the District of Columbia.[4] In 2023, a successful campaign was launched to make the pallid bat the state bat of California.[5] The bill passed both houses unanimously and will take effect on January 1, 2024.[6]