"Last weekend we watched as multiple people and kids trying to climb up the rock to take pics with it," said a Cliffs Crew member who wants to remain anonymous, "figured when some one fell it would bring even more unwanted exposure so it was decided to remove it before someone did fall."
The mermaid mannequin had been atop the more than 50-foot rock since Memorial Day weekend.
A photo from May shows two people on top of the rock along with a rope ladder appearing to install the mermaid.
The Arizona artist who installed the mermaid recently came forward to 10News, but wants to remain anonymous, says they are offering a reward for a safe return of the mermaid.
“The Rock” at Sunset Cliffs is no stranger to unofficial adornments.
In 2006, a large pterodactyl was put on the rock before being washed away.
A peace sign, the numbers "2010,” a Christmas tree, a tiki head, and at one point, a toilet with a Raiders fan wedged inside have all been found in the surf below the rock in the past.