90142
This pattern between testosterone and aggression was first observed in seasonally breeding birds , such as the song sparrow , where testosterone levels rise modestly with the onset of the breeding season to support basic reproductive functions .
 song sparrow
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:
 song sparrow