111661
Grasshopper head size , and thus chewing power , was demonstrated to be greater for individuals raised on rye grass ( a relatively hard grass ) when compared to individuals raised on red clover ( a soft diet ) .
 Grasshopper
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:
 Grasshopper