Auburn Botanic Gardens and Fauna Reserve are hoping to avoid a swansong.
The park is on a mission to replace their 15-year-old mute swan, Barry, who died in April.
Mute swans do make a noise. They are just not as vocal as other species of swan.
Fauna keeper Raine Eagleton said the search had been difficult.
‘‘There are not many swans in captivity in Australia,’’ Ms Eagleton said.
‘‘Because they are so rare, they are very hard to acquire.
‘‘There is one wild colony in Western Australia of about 40.’’
There are at least seven different species of swans in the world.
Ms Eagleton said a mute swan was their preferred choice.
‘‘We have had black swans in the past, they tend to be aggressive to people,’’ Ms Eagleton said.
‘‘Also, mute swans would fit with the theme of the Japanese garden.’’
Mute swans are the second largest water fowl species and are native to Europe and Asia.
Males can weigh up to 12 kilograms and females can weigh up to nine kilograms, making them one of the heaviest flying birds.