@misc{indiciae20308324c152,
  title = {Behaviour of wintering Tundra Swans Cygnus columbianus columbianus at the Eel River delta and Humboldt Bay, California, USA},
  author = {Jeffrey M. Black and Carol Gress and Jacob W. Byers and Emily Jennings and Craig R. Ely},
  year = {2010},
  url = {https://pubs.usgs.gov/publication/70101079},
  note = {Source identifier: 70101079}
}