63967
Birds similar to crested grebes are engraved on the central spine and this completes the engraving work elsewhere .
 crested grebes
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:
 crested grebes