23955
The food is regurgitated , a mouthful at a time , back up to the mouth , where the food , now called the cud , is chewed by the molars , grinding down the coarse vegetation to small particles .
 cud
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:
 cud