BBs LOVE using their noses. It is how they understand their surroundings - learning what smells are good (foods, treats, D24..) and what are not! The nose serves as a direction marker to inform them of specific locations of various things!
Sniffing exercises a large part of their amazing brain & keeps them occupied, so that you can do some quick chores before playing with your BBs again.
The list is endless with the amount of tricks you can teach your BBs just with sniff work!