"You are around [the animals] a lot," he says of his occupation. "I guess there is some realization [by them] that you have done something for them."
Bergmann has bonded with each of the animals in his care, but Bengali is a special case. The Bengal tiger came to the zoo from Texas, where he had been rescued from an abusive, neglectful environment.
"He was emaciated ... you could see all his ribs and bones," Bergmann recalls. "The way he looked, it was like he didn't have a will to live."
The staff slowly nursed Bengali back to health. He underwent surgeries to repair broken teeth and other ailments. His largest challenge, though, was getting back up to his proper weight – 400 pounds – from 180 pounds.
It was when Bengali met an old lioness in the shelter next to his, Bergmann says, that he truly began to come alive. Each day, Bengali walked the fence to catch a glimpse of his new friend, until he finally built up the energy to walk his entire habitat.
"When he went out, he saw her, and he just got so excited," Bergmann said, smiling.
Today, when Bergmann visits, the massive tiger chuffs at him – a greeting – and rubs against the fence.
But helping animals recover from conditions like this isn't achieved by sticking to an eight-hour workday.
"It is sometimes a 24/7 job," Bergmann says. "Dante [a tiger] is feeling uncomfortable, [so] you stay here through the night."
Dante, much the opposite of Bengali, became afraid of a lioness in a neighboring cage after his companion died. It took many nights of comfort and coaxing to help him again become comfortable with his enclosure.
Bergmann credits his family with accommodating his unpredictable schedule – and his habit of occasionally bringing animals home with him to give them a little extra care and attention.