41587
All living canids ( Caninae ) have a ligament analogous to the nuchal ligament of ungulates used to maintain the posture of the head and neckwith little active muscle exertion ; this ligament allows them to conserve energy while running long distances following scent trails with their nose to the ground .
 Caninae
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Caninae