Feng Xu, Weikang Yang, Ming Ma and David A. Blank, 2020. Vigilance of the Demoiselle Crane Antropoides virgo: The Effects of Group Size, Human Disturbance, and Predation Vulnerability. Pakistan J. Zool., 53: 371-374. https://dx.doi.org/10.17582/journal.pjz/20190222070230