Assertion: orangutan | /r/Desires | gestural signals
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Source sentences:
text: Another possibility is that orangutans prefer gestural signals because those do not bear an entirely arbitrary relationship with what they refer to, with gestures used by keepers either presenting a certain degree of iconicity (the signal resembles the referent) or being deictic (the signal points towards the referent, which is then the object that is close to the tip of the keepers’ finger).