Zoo general manager John Appleby said she arrived at Mogo Zoo at 1pm yesterday.

She was initially released into the nighthouse, a 10-metre structure where the giraffes sleep, where her pen was separated by a wire fence from resident giraffes Ajuma, baby Shaba and Shani, who is Tanzi's sister.

Later in the afternoon, the male Ajuma was moved into a separate pen and the two sisters got to know each other.

But Mr Appleby said it was unlikely they would recognise each other.

"We don't think that will really happen," he said.

"They will certainly recognise another giraffe and they're comfortable with her but I don't think they're going to say 'Oh, I remember you sis'."

Tanzi has been brought to the zoo as part of a breeding program for the endangered Rothschild's giraffe.

Mr Appleby said the animals had a 16-month gestation period and the zoo was hopeful Tanzi and Ajuma would get to work on making a new baby soon.