They were born on January 10 after male pygmy marmoset Churi was introduced to a female from Adelaide Zoo called Intia during July 2011.

Halls Gap Zoo head keeper Alisha Bunting said Intia and Churi 'hit it off' straight away and before long they had two babies to look after.

"It's been amazing," she said. "Everyone loves them.

"They are cute animals with a lot of personality."

She said the male marmoset spent most of his time carrying the babies on his back, while the female fed them.

"We find most mums who visit the zoo approve of that set up," she said. "Both Churi and Intia display a lot of teamwork when looking after their young."

The primates are native to South America and live in holes they gouge into evergreen trees.

They eat insects, fruit and flower buds and live in groups of five to six, led by an adult pair.

Ms Bunting said pygmy marmosets were the smallest primates in the world.

"Because they're quite small they tend to be eaten by other animals in the South American rainforests," she said.

She said the baby marmosets would be named after zoo keepers could determine their sex.