81909
Lydekker added that the line of back is nearly straight with 13 pairs of ribs ; the tail is tufted and reaching about to the hocks ; the horns are more or less markedly triangular for the greater part of their length and situated low down on the skull ; the muzzle is broad , and the hair sparse in adults .
 Lydekker
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:
 Lydekker