 The Adams River valley supports large populations of mule deer , with smaller herds of white @-@ tail deer . Black bears are common in the watershed . The bear population grows substantially during the fall as they gather from adjacent valleys to feed on the spawning salmon . In the upper river valley , moose are common , and the headwaters of the river contain grizzly bear habitat . Several species of aquatic mammals are found on the river , including beaver , mink , and river otter . 
 The Adams River valley <a href='uninflect' title='1'><mark>supports</mark></a> large populations of mule deer , with smaller herds of white @-@ tail deer . Black bears <a href='drop_aux' title='2'><mark>are</mark></a>common in the watershed . The bear population <a href='uninflect' title='3'><mark>grows</mark></a> substantially during the fall as they gather from adjacent valleys to feed on the spawning salmon . In the upper river valley , moose <a href='drop_aux' title='4'><mark>are</mark></a>common , and the headwaters of the river contain grizzly bear habitat . Several species of aquatic mammals are found on the river , including beaver , mink , and river otter . 
Da Adams River valley support large populations of mule deer , with smaller herds of white @-@ tail deer . Black bears common in the watershed . The bear population grow substantially during the fall as they gather from adjacent valleys to feed on tdaspawning salmon . In the upper river valley , moose common , and the headwaters of the river contain grizzly bear habitat . Several species of aquatic mammals are found on the river , including beaver , mink , and river otter .