21803
Due to its seclusion , the good supply of nutrients and the space , the relatively natural stands of wood ( partly alder and birch fen woods ) create an important habitat for black grouse , a species which is very susceptible to disturbance and is threatened by extinction .
 animal: black grouse
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: black grouse 
Answer:
 animal: black grouse