वर्णनम्Common Chimpanzee uses cuboid tool in the lab.png
English: A chimpanzee using a cuboid-shaped hammer to crack open a nut in a pit of the anvil
दिनाङ्क
अज्ञातदिनाङ्कः ।
Unknown date
, no later than August 16, 2013
स्रोतः
Cornelia Schrauf, Josep Call, Koki Fuwa, and Satoshi Hirata (2012) Do Chimpanzees Use Weight to Select Hammer Tools? PLOS ONE; DOI: 10.1371/journal.pone.0041044
लेखकः
Cornelia Schrauf, Josep Call, Koki Fuwa and Satoshi Hirata