Eloise the ape gives birth at San Diego Zoo after her birth control fails (NSFW)

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Congratulations are in order for an ape who gave birth at the San Diego Zoo — even though she’s been on birth control for years.

The special delivery of Eloise’s baby on Nov. 12 came as a complete shock to workers, who had no clue she was even expecting.

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The 37-year-old siamang had been on a chemical contraception in an effort to maintain genetic diversity in the zoo population of the gibbon species, USA Today reported.

“We’re not certain why birth control didn’t work in this case, but as with humans, it is not uncommon for contraceptive failure to happen from time to time,” said the zoo’s animal care manager Jill Andrews.

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