@misc{indiciaef66586ca81c5,
  title = {Empirical estimates of body drag of large waterfowl and raptors},
  author = {C.J. Pennycuick and H.H. Obrecht and M.R. Fuller},
  year = {1988},
  doi = {10.1242/jeb.135.1.253},
  url = {https://pubs.usgs.gov/publication/5220765},
  note = {Source identifier: 5220765}
}