TY  - RPRT
TI  - Empirical estimates of body drag of large waterfowl and raptors
AU  - C.J. Pennycuick
AU  - H.H. Obrecht
AU  - M.R. Fuller
PY  - 1988
DO  - 10.1242/jeb.135.1.253
UR  - https://pubs.usgs.gov/publication/5220765
ID  - 5220765
ER  -