60096
By 2010 , after an 11-year effort , it had been successfully reintroduced into Colorado , where it had become extirpated in the 1970 s .
 Colorado
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:
 Colorado