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The platypus is a carnivore : it feeds on annelid worms , insect larvae , freshwater shrimp , and freshwater yabby ( crayfish ) that it digs out of the riverbed with its snout or catches while swimming .
 annelid, insect larvae, shrimp, crayfish
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 annelid, insect larvae, shrimp, crayfish