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Squirrels are generally small animals , ranging in size from the African pygmy squirrel and least pygmy squirrel at in total length and just in weight , to the Bhutan giant flying squirrel at up to in total length , and several marmot species , which can weigh or more .
 African pygmy squirrel, least pygmy squirrel, Bhutan giant flying squirrel, marmot
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:
 African pygmy squirrel, least pygmy squirrel, Bhutan giant flying squirrel, marmot