Volunteers were putting out headstones and spider webs in preparations for Sequoia Park Zoo's Boo at the Zoo event next weekend.
"It's a massive effort," said Hilary Lebow, marketing and events coordinator for the Sequoia Park Zoo.
Lebow coordinates volunteers to help with set up a week in advance for the event. The entire zoo is decorated for the annual Halloween event.
Boo at the Zoo will be held on Oct. 26 from noon to 4 p.m. and draws one of the largest crowds to the zoo, attendance goes up 10 to 15 percent each year.