Assertion: raven | /r/CapableOf | pull the string
Facets:
Source sentences:
text: Most ravens were able to pull the string, holding the loops with their feet, and get the food on their first try.
text: One classic experiment had ravens pulling a string and holding it while getting another grip, to reach a piece of meat hanging below the cage out of reach.
text: To get to the food, a raven had to follow a series of actions: pull up a string stretch, hold a loop of it on the perch with a claw, then pull up another stretch and hold that loop.
text: Most ravens were able to pull the string, holding the loops with their feet, and get the food on their first try.