Why would I want to suck the head of a boiled crawfish?

The head of the crawfish contains an organ called the "hepatapancreas" which contains fat and is very rich in flavor. Many people call this the "fat" of the crawfish. However, crawfish actually contain very little fat. Cajuns suck the head to get this "fat," but you could just dig it out with your finger. No matter how you get it, do not miss out on this part of the crawfish.