Other Marine Mammals

NOAA Fisheries manages most marine mammals, however United States Fish and Wildlife Service manages Northern Sea Otters, Walrus, Manatees, and Polar Bears.

To report a dead Sea Otter, please email the United States Fish and Wildlife
In Washington & Oregon:  http://www.fws.gov/wafwo/strandings.html 
In California:  http://www.werc.usgs.gov/seaotterstranding  

Species Information

Sea Otters

River Otters (not considered a marine mammal even though it can be seen in salt water)

Walrus Non-govt link

Manatee

Polar Bear Non-govt link