However, I can tell you why rabbits enjoy having their chins rubbed:
* Scent glands: Rabbits have scent glands on their chins, which they use to mark their territory and communicate with other rabbits. Rubbing their chins releases these scents, allowing them to mark you as part of their "territory" or social group.
* Pleasure: Many rabbits enjoy the feeling of being petted and rubbed, especially on their chins, because it feels good.
* Bonding: Rubbing your rabbit's chin can be a way to bond with them and show them affection.
It's important to note that not all rabbits enjoy having their chins rubbed. Some may be sensitive about this area, so it's important to pay attention to your rabbit's body language and stop if they seem uncomfortable.