Even so, he has no intention of slowing down.
"It's very difficult to find a climber. My schedule is booked until December 20," he said.
Even though his profession is highly sought after, these tree climbers have no job security.
They are paid by the day, with no contracts and no social security.
"Their work should be regularized as field technicians and they should get training," said Pereira.
Despite the risks, Zelao intends on passing on the baton to his 19- and 21-year-old sons once his body says stop.
