@misc{indiciae96eecaf0ab99,
  title = {Solution acceptance by common ravens (Corvus corax) given two-bottle preference tests.},
  author = {A E Harriman and E G Fry},
  year = {1990},
  doi = {10.2466/pr0.1990.67.1.19},
  url = {https://pubmed.ncbi.nlm.nih.gov/2236395/},
  note = {Source identifier: 2236395}
}