Giant flies with 21 cm ( 8.27 in ) MORE : Asian giant hornets and other terrifying creatures . wingspan appeared in Sichuan for the first time . This may be the world 's largest aquatic flying insect . The presence of the dobsonfly indicates clean water is nearby .
Giant flies with 21 cm ( 8.27 in ) wingspan appeared in Sichuan for the first time . This may be the world 's largest aquatic flying insect . The presence of the dobsonfly indicates clean water is nearby .