She Wolf's blog: "What Else Is New?"

Wolves express themselves in many ways. There is the howl-bark, which is usually a distress call. It starts out as a high pitched bark and quickly turns into a short howl. It's a "Wolf Alarm", a warning to pack mates of possible danger. There are the yips, yaps, squeals, and chirps of play. These sounds are also used to show submissiveness to higher ranking pack members. The Wolf Growl is distinctive. It is a very bass sound, which emits from deep inside the animal. It is a warning that should be taken seriously. The Wolf Howl is harmonic. The howl usually shifts pitches to achieve a discord. It is believed that this is done to confuse unwelcome visitors as to the actual size of the pack. It appears that Wolves love a good Howl.