92430
On rides with gauchos into the interior to explore geology and collect more fossils , Darwin gained social , political and anthropological insights into both native and colonial people at a time of revolution , and learnt that two types of rhea had separate but overlapping territories .
 Darwin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Darwin