@misc{indiciae89c004882a42,
  title = {Falcon versus grouse: flight adaptations of a predator and its prey},
  author = {C.J. Pennycuick and M.R. Fuller and J.J. Oar and S.J. Kirkpatrick},
  year = {1994},
  url = {https://pubs.usgs.gov/publication/5222727},
  note = {Source identifier: 5222727}
}