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Skeleton of a muskrat 

 How the young flies clean up a dead animal, leaving only the bones which go back into the earth as mineral matter 



From left to right the tubes contain, banana, coral fungus, boletus fungus, sugar, gluten, yolk of egg, white of egg 

 and cheese. Each tube contains ten young greenbottle flies who were observed to thrive on these fresh- 

 foods. Note liquification of foods in tubes 5, 6 and 7 



