The most prominent feature of the walrus is its long tusks. These are elongated canines , which are present in both male and female walruses and can reach a length of 1 m (3 ft 3 in) and weigh up to kg (12 lb).  Tusks are slightly longer and thicker among males, which use them for fighting, dominance and display; the strongest males with the largest tusks typically dominate social groups. Tusks are also used to form and maintain holes in the ice and aid the walrus in climbing out of water onto ice.  Tusks were once thought to be used to dig out prey from the seabed, but analyses of abrasion patterns on the tusks indicate they are dragged through the sediment while the upper edge of the snout is used for digging.  While the dentition of walruses is highly variable, they generally have relatively few teeth other than the tusks. The maximal number of teeth is 38 with dentition formula: , but over half of the teeth are rudimentary and occur with less than 50% frequency, such that a typical dentition includes only 18 teeth 
ABR’s psychoacoustic technology was developed primarily, with a few exceptions, through a combination of clinical observation and Pilot Studies. In other words, we studied a small sample of subjects (via EEG) and then predicted possible effects. These effects were then observed in a clinical setting with a much larger group of persons-mostly in my psychotherapy office, in individual or group sessions, and by other therapists throughout the world. It is important, I think, to keep these distinctions in mind as you read over the studies and comments in this section.