@misc{indiciaebd9c5f222acc,
  title = {Behavioral effects of environmental enrichment on harbor seals (Phoca vitulina concolor) and gray seals (Halichoerus grypus)},
  author = {S. A. Hunter and M. S. Bay and M. L. Martin and Jeffrey S. Hatfield},
  year = {2002},
  doi = {10.1002/zoo.10042},
  url = {https://pubs.usgs.gov/publication/5224179},
  note = {Source identifier: 5224179}
}