26103
Archaeopteryx " was found to form a grade at the base of Avialae with " Xiaotingia " , " Anchiornis " , and " Aurornis " .
 Avialae, Xiaotingia, Anchiornis, Aurornis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Avialae, Xiaotingia, Anchiornis, Aurornis