This is a way of marking territory if they are rubbing the sides of their faces on the object. Cats have scent glands around their lips and on their chins. The facial pheromones that they mark with are signals of a happy or calm cat to other cats.
The part that simultaneously enables the axle to flex while transmitting the driving force is called a drive axle joint, and is also known as a constant velocity (or CV) joint. The CV Boot is a ribbed, rubber flexible boot that keeps water and dirt out of the joint and the special grease inside the joint.
CVT is a user and environmentally friendly automatic type transmission. While the concept of a CVT transmission is as old as the motor car itself, it has taken Honda to re-engineer the idea to suit the demands of the 21st Century, including full grade logic electronic control with drive and sport modes.