No, not the bassist for the Red Hot Chili Peppers. The common flea is dark colored and flattened from side to side with bristles pointing back. The flea has sucking mouthparts that are used for the drinking of blood of mammals and birds. The flea has a complete metamorphosis, from egg stage, to larval, pupal and adult stage. There are many types of fleas including the cat, dog, human and squirrel flea. Although the type of flea has a preferred host, that does not mean that they will avoid attacking another type of host. Most fleas prefer warmth rather than cold and will abandon a host when it dies. This behavior is a possibility for the cause of bubonic plague, as the flea left the host and found its way to a human for a new host. Fleas are attracted to movement. Often a deserted house is entered and the vibrations of the movement that are made cause the fleas to come out of their hiding places and attack the intruder.