{"fact":"One clever crow named Klaus figured out how to snag treats from his partners in a token experiment, taking tokens from other compartments in 56 out of 73 observed transfer attempts.","context":"Most of the transfers (indirect and passive) were observed by one individual (Klaus taking tokens from the other compartment in 56 out of 73 occasions).","source":"Claudia A. F. Wascher; B'eatrice Feider; Thomas Bugnyar; Val'erie Dufour, Crows and common ravens do not reciprocally exchange tokens with a conspecific to gain food rewards, 10.1111/eth.12970","index":430}