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FILE - In this July 21, 2016 file photo, fireflies seeking mates light up in synchronized bursts as photographers take long-exposure pictures, inside Piedra Canteada, a tourist camp cooperatively owned by 42 local families, inside an old-growth forest near the town of Nanacamilpa, Tlaxcala state, Mexico. The families purchased the 1560-acre (630-hectare) tract of land from a private owner in 1990 and began offering camping and forest visits, while continuing to exploit the logging quota authorized by the government. Only in 2011, did they realize the potential draw of the local firefly population, and begin advertising nighttime viewing tours. (AP Photo/Rebecca Blackwell, File)