TY  - RPRT
TI  - Leaf-pile pulling: an unusual play pattern in wild chimpanzees.
AU  - Toshisada Nishida
AU  - William Wallauer
PY  - 2003
DO  - 10.1002/ajp.10099
UR  - https://pubmed.ncbi.nlm.nih.gov/12910468/
ID  - 12910468
ER  -