Credit: In this July 21, 2016 photo, fireflies light up a section of the forest inside Piedra Canteada, near Nanacamilpa, Tlaxcala state, Mexico. The fireflies appear in numbers between 8:30 and 9:30p.m. each night during the two-month season. At times, hundreds of the bioluminescent beetles will synchronize their lights, blinking on and off in perfect rhythm. (AP Photo/Rebecca Blackwell)

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