66376
Because of this - along with the breaking of tree limbs under their collective weight and the great amount of mast they consumed - passenger pigeons are thought to have influenced both the structure of eastern forests and the composition of the species present there .
 mast
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:
 mast