How did the chimpanzee named david greybeard behave when he came in contact with goodall in the forests of gombe

The chimpanzee David Greybeard was actually accepting of Jane Goodall.  The chimpanzee David Greybeard actually “introduced” Jane Goodall to other members of David Greybeard’s family.   And, most notably (and surprisingly) to Jane Goodall, David Greybeard actually let her groom him.  What most surprised Jane Goodall was that David Greybeard was a full-grown adult male chimpanzee, and he let a human touch him by manner of grooming.