TY  - RPRT
TI  - Solution acceptance by common ravens (Corvus corax) given two-bottle preference tests.
AU  - A E Harriman
AU  - E G Fry
PY  - 1990
DO  - 10.2466/pr0.1990.67.1.19
UR  - https://pubmed.ncbi.nlm.nih.gov/2236395/
ID  - 2236395
ER  -