Pelican Islands National Wildlife Refuge was established in 1903 by President Theodore Roosevelt. While it was created to protect the habitat of migratory and resident birds, the refuge’s land and waters are also home to other interesting animals, including the North American river otter. Able to live in both fresh and saltwater, the river otter is a clever, adorable and sometimes dangerous animal. Is this one angling for a belly rub (which you should never do) or thinking about its next meal? Photo by Keenan Adams, U.S. Fish and Wildlife Service.