@misc{indiciae1909bbaa5cca,
  title = {Mate preference in wild and domesticated (game-farm) mallards: II. Pairing success},
  author = {K.M. Cheng and R.N. Shoffner and R.E. Phillips and F.B. Lee},
  year = {1979},
  url = {https://pubs.usgs.gov/publication/1001512},
  note = {Source identifier: 1001512}
}