Terrestrial mammals included the mountain lion, bobcat, bighorn sheep, mule deer as well as a variety of rodents and lagomorphs including the California ground squirrel, San Diego kangaroo rat, and brush rabbit. Black bears, jaguars and sea otters historically populated the area, but their range has been restricted by human encroachment and the jaguar and the sea otter are now rarely, if ever, observed. Aquatic mammals included the gray whale, a seasonal migratory animal, as well as the bottlenose dolphin, killer whale, and California sea lion and on rare occasion, Guadalupe fur seal. In recent times the region has seen the rebound of artiodactyls such as the Peninsular bighorn sheep, a distinct population segment of the desert bighorn sheep.