An egret catches a fish in the canals of Xochimilco, Mexico City, Thursday, Aug. 12, 2021, as Mexico City prepares for the 500th anniversary of the fall of the Aztec capital of Tenochtitlan. The canals and floating gardens of Xochimilco are the last remnants of a vast water transport system built by the Aztecs to serve their capital of Tenochtitlán. (AP Photo /Marco Ugarte)