@misc{indiciae9f24ed2b0f50,
  title = {Diet and gut morphology of male mallards during winter in North Dakota},
  author = {R.E. Olsen and R. R. Cox and A. D. Afton and C.D. Ankney},
  year = {2011},
  doi = {10.1675/063.034.0107},
  url = {https://pubs.usgs.gov/publication/70035704},
  note = {Source identifier: 70035704}
}