A chimpanzee at an ape rescue centre has had twins - despite being on birth control pills.

The baby girls have been named Thelma and Louise after the film fugitives because staff at Monkey World in Dorset said they were "birth control outlaws".

Female chimps at the centre are given contraception to avoid overpopulation, but a course of antibiotics caused mother Cherri's pill to fail.

Centre director Alison Cronin said: "So far, Cherri is doing a great job."