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  • Sybill Amelon, a wildlife research biologist with the US Forest Service, handles an Indiana bat in her lab in Missouri. Indiana bats are one of several endangered bat species throughout the United States.

  • Utah Division of Wildlife Resources biologists and volunteers hang nets around a small pond on Antelope Island on Tuesday, May, 27, 2014. The fine nets, known as "mist nets" are thin enough that they are difficult for bats to see, but strong enough to hold the bats.

  • Wildlife Technician Brandon Flack looks at the wing of a silver-haired bat on Antelope Island on Tuesday, May, 27, 2014. Biologists check the wing membrane of each bat for signs of disease or infection.

  • As the sun goes down, Clarissa Starbuck, left, and Sybill Amelon set up a trap site along the Blue Ridge Parkway in North Carolina during the SBDN Bio Blitz. For one weekend a year, biologists from around the south gather for a marathon of intensive bat capturing.

  • Wildlife Technicians Skyler Farnsworth, left, and Brandon Flack untangle a bat from a mist net.

  • Brandon Flack holds a silver-haired bat on Antelope Island on Tuesday, May, 27, 2014. While many species of bats live on the island, biologists only caught silver-haired bats Tuesday night. Silver-haired bats roost in trees and the nets were set-up near one of the few stands of trees on the island.

  • Wildlife Conservation Biologist Adam Brewerton checks a bat detector while trapping bats on Antelope Island. The small electronic device records bat calls and displays the rhythm and frequencies. By watching the changes in frequencies, biologists are able to tell which species of bats are nearby.

  • Sybill Amelon attaches a radio to the back of an Indiana bat after trapping it in northeast Missouri. Researchers will use the radio to find out what kind of habitats the endangered bats are using for their roosts.

  • Sarah Pennington carries an anabat, a device that records bat calls in the Missouri Ozarks. Pennington, a graduate student at the University of Missouri spends three months in the summer setting up anabats in hundreds of locations around the state to learn more about bat habitats.