You Place Equal Numbers of Dark and Light Varieties of Feeder

Essay

You place equal numbers of dark and light varieties of feeder crickets into a terrarium containing a lizard. After two days, you notice that there are fewer light-colored crickets than dark-colored crickets. What process is taking place on a small scale within the terrarium? Design an experiment in which you could determine if color or taste is the primary factor responsible for the selective feeding of the lizard.