The common loon has also faced a decline in breeding range due to hunting , predation , and water-level fluctuations , or flooding . Some environmentalists attempt to increase nesting success by mitigating the effects of some of these threats , namely terrestrial predation and water-level fluctuations , through the deployment of rafts in the loon 's breeding territories . In addition , artificial floating nesting platforms have been provided for the common loon in some lakes to reduce the impact of changing water levels due to dams and other human activities . The common loon abandons lakes that fail to provide suitable nesting habitat due to shoreline development . It is endangered by personal water-craft and powerboats that may drown newly born chicks , wash eggs away , or swamp nests . It is still considered an " injured " species in Alaska as a result of the Exxon Valdez oil spill
Exxon Valdez oil spill
Exxon Valdez oil spill
Common loon