83885
Like opossums , mice , and moles , hedgehogs have some natural immunity against some snake venom through the protein erinacin in the animal 's muscular system , although it is available only in small amounts and a viper bite may still be fatal .
 moles
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:
 moles