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DALLAS – The Dallas Zoo announced the birth of four black-and-white ruffed lemurs, officials said Friday.

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The infants, which is what a baby lemur is called, were born on March 7 to parents Alina and Iggy, the zoo said in a statement that was posted to social media. It was the first time the species had been born at the zoo in more than 30 years.

In a video shared on Twitter, associate curator of mammals Linda King said Alina is a first-time mother. Zoo officials had concerns that Alina was not producing enough milk for her babies, so zoologists fed the infants by hand, The Dallas Morning News reported.

The lemurs’ names have yet to be announced, according to the newspaper.

Zoo officials said the young lemurs are “thriving” but have yet to make their public debut, the Morning News reported. Officials said they will be introduced after they are certain the lemurs are strong enough to navigate their habitat at the zoo’s Lemur Lookout.

Another set of babies — twin emperor tamarin monkeys — were born at the zoo on March 29, according to the newspaper.