A Queensland zoo has boosted security around a rare monkey that has given birth more than a year after being stolen.

Conchetta, a cotton-top tamarin, and her breeding partner Tonto were stolen from Brisbane's Alma Park Zoo in October 2010.

Conchetta, the a cotton-top tamarin, after she was handed in. Credit:Robert Peet

Tonto was found bludgeoned to death close to the zoo and Conchetta, who was heavily pregnant with twins, was thought to have died.

However, she was handed in at a wildlife park south of Sydney about two weeks after the abduction.