45950
Hibernation of swallows was considered a possibility even by as acute an observer as Rev. Gilbert White , in his " The Natural History and Antiquities of Selborne " ( 1789 , based on decades of observations ) .
 Gilbert White
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gilbert White