A river otter, left, eyes a bird Thursday, Jan. 3, 2013, in San Francisco. For the first time in decades, a river otter has made San Francisco its home, taking up residence in the ruins

 

              A river otter, left, eyes a bird Thursday, Jan. 3, 2013, in San Francisco. For the first time in decades, a river otter has made San Francisco its home, taking up residence in the ruins
A river otter, left, eyes a bird Thursday, Jan. 3, 2013, in San Francisco. For the first time in decades, a river otter has made San Francisco its home, taking up residence in the ruins of the Sutro baths, a 19th century seaside pond facing the Pacific Ocean. (AP Photo/Ben Margot)