Photo: Paul Chinn, The Chronicle

A sea lion keeps a watchful eye on a gull at Pier 39 in San Francisco, Calif. on Saturday, Jan. 19, 2013. 

A sea lion keeps a watchful eye on a gull at Pier 39 in San Francisco, Calif. on Saturday, Jan. 19, 2013. 


Photo: Paul Chinn, The Chronicle

A sea lion pup in San Francisco. 

A sea lion pup in San Francisco. 


A humpback whale flukes, or lifts its tail out of the water as it dives, in a large group of sea lions on July 30, 2014 on Monterey Bay offshore of Moss Landing, Calif.

A humpback whale flukes, or lifts its tail out of the water as it dives, in a large group of sea lions on July 30, 2014 on Monterey Bay offshore of Moss Landing, Calif.


Photo: Pete Kiehart, The Chronicle

A sea lion pup underweight weight in Feb. 2015 on the Channel Islands in California.

A sea lion pup underweight weight in Feb. 2015 on the Channel Islands in California.


Photo: Jim Milbury

A sea lion pup underweight weight in Feb. 2015 on the Channel Islands in California.

A sea lion pup underweight weight in Feb. 2015 on the Channel Islands in California.


Photo: Jim Milbury

A sea lion pup underweight weight in Feb. 2015 on the Channel Islands in California.

A sea lion pup underweight weight in Feb. 2015 on the Channel Islands in California.


Photo: Jim Milbury

Two sea lions interact on the dock at Pier 39 on Monday, December 14, 2015 in San Francisco, Calif.

Two sea lions interact on the dock at Pier 39 on Monday, December 14, 2015 in San Francisco, Calif.


Photo: Lea Suzuki, The Chronicle

A sea lion sleeps during 27th anniversary of the sea lions taking up residence at Pier 39 in San Francisco, Calif., on Sunday, January 22, 2017.

A sea lion sleeps during 27th anniversary of the sea lions taking up residence at Pier 39 in San Francisco, Calif., on Sunday, January 22, 2017.


Photo: Scott Strazzante, The Chronicle

Sea lions relax during 27th anniversary of their taking up residence at Pier 39 in San Francisco, Calif., on Sunday, January 22, 2017.

Sea lions relax during 27th anniversary of their taking up residence at Pier 39 in San Francisco, Calif., on Sunday, January 22, 2017.


Photo: Scott Strazzante, The Chronicle

Visitors look at a group of sea lions during 27th anniversary of the sea lions taking up residence at Pier 39 in San Francisco, Calif., on Sunday, January 22, 2017.

Visitors look at a group of sea lions during 27th anniversary of the sea lions taking up residence at Pier 39 in San Francisco, Calif., on Sunday, January 22, 2017.


Photo: Scott Strazzante, The Chronicle

A sea lion swims during 27th anniversary of the sea lions taking up residence at Pier 39 in San Francisco, Calif., on Sunday, January 22, 2017.

A sea lion swims during 27th anniversary of the sea lions taking up residence at Pier 39 in San Francisco, Calif., on Sunday, January 22, 2017.


Photo: Scott Strazzante, The Chronicle

Sea lion poop patrol at Pier 39 (4 of 4)

Here’s a bonus dirty sea lion job: the pier also employs a sea lion herder to walk the human docks and keep any aggressive males from trying to establish new territory. As with the float cleanings, Chandor says the sea lions are totally used to being shooed away and will do so when they hear the jingle of a crewmember’s belt.

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Sea lion poop patrol at Pier 39 (4 of 4)

Here’s a bonus dirty sea lion job: the pier also employs a sea lion herder to walk the human docks and keep any aggressive males from trying to establish new

… more


Photo: Greg Keraghosian

North America, United States, California, San Francisco, Lighthouse at Forbes Island, sea lions lying on pier. (Photo by: JTB Photo/UIG via Getty Images)

North America, United States, California, San Francisco, Lighthouse at Forbes Island, sea lions lying on pier. (Photo by: JTB Photo/UIG via Getty Images)


Photo: JTB Photo/UIG Via Getty Images

California sea lions at Seal Cove, one of the many species of wildlife found on south east Farallon Island, on Wednesday October 12, 2011, off the coast of San Francisco, Ca. 

California sea lions at Seal Cove, one of the many species of wildlife found on south east Farallon Island, on Wednesday October 12, 2011, off the coast of San Francisco, Ca. 


Photo: Michael Macor, The Chronicle

Sea lions swim in the water as others lay on the dock at Pier 39 on Monday, December 14, 2015 in San Francisco, Calif.

Sea lions swim in the water as others lay on the dock at Pier 39 on Monday, December 14, 2015 in San Francisco, Calif.


Photo: Lea Suzuki, The Chronicle

Sea lions are seen from aboard the NOAA research vessel Fulmar, near San Francisco, Calif. on Fri. September 25, 2015. The crew of the Fulmar conducts the study ACCESS (Applied California Current Ecosystems Studies) a partnership that uses ocean research to inform resource managers, policy makers and conservation partners. less
Sea lions are seen from aboard the NOAA research vessel Fulmar, near San Francisco, Calif. on Fri. September 25, 2015. The crew of the Fulmar conducts the study ACCESS (Applied California Current Ecosystems … more


Photo: Michael Macor, The Chronicle

A sea lion keeps a watchful eye on a gull at Pier 39 in San Francisco, Calif. on Saturday, Jan. 19, 2013. 

A sea lion keeps a watchful eye on a gull at Pier 39 in San Francisco, Calif. on Saturday, Jan. 19, 2013. 


Photo: Paul Chinn / The Chronicle

A Steller Sea lion sits proudly amongst his kind on a exclusive end of Ano Nuevo Island which is south of Half Moon Bay on June 29, 2009.

A Steller Sea lion sits proudly amongst his kind on a exclusive end of Ano Nuevo Island which is south of Half Moon Bay on June 29, 2009.


Photo: Frederic Larson / The Chronicle

Sea lions huddle close and rest at the Pier 39 docks to the delight of tourists on Thursday, August 7, 2014 in San Francisco, Calif. 

Sea lions huddle close and rest at the Pier 39 docks to the delight of tourists on Thursday, August 7, 2014 in San Francisco, Calif. 


Photo: Kevin N. Hume, The Chronicle

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