@misc{indiciae539c6f3725c9,
  title = {Observation of nighttime feeding behavior of ducks},
  author = {George A. Swanson and Alan B. Sargeant},
  year = {1972},
  doi = {10.2307/3799457},
  url = {https://pubs.usgs.gov/publication/70210093},
  note = {Source identifier: 70210093}
}