Razali, who lost 80 percent of his hearing after falling ill as a baby, started working at the park over two decades ago, and has risen to the position of deputy head avian keeper.
He communicates with the birds through grunts, gestures and body languages and told AFP that he recognises the birds by their "behaviours and personalities".
"All of them are my friends," he added, communicating through a mix of gestures and Malay.
"He has a way of communicating with the birds that very few of us can," said assistant curator Angelin Lim. "Just by a look, he knows whether or not the bird is well."
Communication with his colleagues can be more challenging than with the birds.
The hyacinth macaws, the world's largest parrots, stopped squawking and watched him curiously before following him.
One of the giant birds perched on his shoulder, playfully rubbed his finger with its beak -- a sign of trust and affection -- and ate out of his hand.
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