This brings up an interesting point that isn't discussed much. Leghorns are a specific breed that all share the same characteristics, but within the breed (whether it's leghorns or any other breed) there are strains. A strain is within the breed, and will have descended from one flock of a certain breed. Strains of leghorn may all look like leghorns, but will have different characteristics, one of which is temperament. So while one strain of leghorn may be flightly enough to drive you crazy, those from another strain may be as docile as a dual purpose breed.