An eastern hoolock gibbon peers through a chain-link fence while waiting for a meal from caregivers. The center is home to the largest and rarest group of gibbons in the Western Hemisphere. (Carlos Chavez / Los Angeles Times)
A gibbon at the Saugus refuge. The sound of a gibbon “singing” at a zoo captivated Mootnick when he was 9. “I also identified with them,” Mootnick said in a 2008
A caregiver carries vegetables through the compound to feed the primates. (Carlos Chavez / Los Angeles Times)