_Description._--Adults are about 5 feet in length and weigh up to 250 pounds; males are approximately a quarter larger than females. The hair seals differ from the sea lions and fur seals in a number of respects. The body is widest in the midsection rather than in the chest. The neck is short and slim. The eyes are large and there are no external ears. The hind flippers are not reversible but are permanently directed posteriorly. The pelage is short, stiff, and directed posteriorly. The ground color is silver gray or yellow; usually it is yellow, blotched and marbled with black, dusky or gray. Hair seals range over the northern Atlantic and Pacific oceans, occurring southward along the Pacific Coast of North America to central Mexico. Six races are recognized by Doutt (1942: 115). The hair seal is the common seal in Puget Sound, the Strait of Juan De Fuca and on the ocean coast. Scheffer and Slipp (1944: 373) estimate that 5,000 live along the coast of Washington. Hair seals are social to some degree but are often seen singly. In Puget Sound, where there are relatively few hauling-out areas, they rarely leave the water but on the ocean coast they emerge to bask on the reefs. On Destruction Island, Jefferson County, V. B. Scheffer and I watched a herd of about 20 animals that lay on a reef exposed by low tide. According to the lighthouse keeper the reef was occupied daily by these seals. Scheffer and Slipp (_loc. cit._, p. 388) report herds of up to 200 hair seals. In Puget Sound 10 to 20 seals seem to be the usual number in a herd, but occasionally there are as many as 50. Hair seals often exhibit curiosity concerning small boats; the seals lie in the water with only their round heads above the surface, staring at the boat for many minutes. Constant shooting has made them shy and any quick movement will cause them to dive; several dived instantly when I pointed either a stick or gun at them. Hair seals are less spectacular than sea lions. When basking on rocks the seals are silent. When an observer is yet a long distance away the seals raise their small heads and remain on the alert. When they take to the water, they travel with a jerking motion. In the water one rarely sees more than their heads. When they dive they usually sink below the surface, never making the spectacular arching dive so typical of the sea lions.