Researcher Roger Fouts describes how Washoe, who had lost both her offspring as infants, reacted when a keeper told her that her own newborn had just died. Looking deep into the grieving woman’s eyes, Washoe signed, ‘Cry,’ tracing on her own cheek the path a tear would take down a humans (chimps don’t shed tears). Then Washoe signed, ‘Please Person Hug.’
Field Notes on the Compassionate Life: A Search for the Soul of Kindness by Marc Ian Barasch (Washoe was the first chimp to use American Sign Language)