@misc{indiciae14c9ad57b259,
  title = {Effects of introducing foxes and raccoons on herring gull colonies},
  author = {J.A. Kadlec},
  year = {1971},
  doi = {10.2307/3799766},
  url = {https://pubs.usgs.gov/publication/5220557},
  note = {Source identifier: 5220557}
}