Is There Any Aerodynamic Obstacle to Gliding in Great Bustard?

Keskin G., Durmuş S., Karakaya M., Karataş M. M.

ACTA ZOOLOGICA BULGARICA, vol.73, no.1, pp.95-98, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 73 Issue: 1
  • Publication Date: 2021
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, Veterinary Science Database
  • Page Numbers: pp.95-98
  • Keywords: bird flight, great bustard, Otis tarda, soaring, OTIS-TARDA, POWER-LINES, FLIGHT, POPULATION, MORTALITY, AVES
  • Eskisehir Osmangazi University Affiliated: Yes


Gliding and soaring are important flight styles, which reduce the energy consumption of birds. Most of the migratory birds and raptors take advantage of these flight styles in order to stay in the air much longer. However, gliding and soaring cannot be seen in the great bustard Otis tarda, which prefers continuous flapping flight style. This study has been focused on possible glide ratio performance, which is not related to the weight of the great bustard. In this study, the glide performance of the great bustard is proved and calculated by CFD simulations. Results show that although great bustard is known as poor flyer, there is no aerodynamic obstacle to perform gliding or soaring. The possible reasons such as the lack of long-distance migrations and feeding behaviour are discussed.