Last month, the animal population at the Dallas Zoo expanded with the arrival of four adorable baby monkeys.

On February 1, emperor tamarin monkeys Lettie and Roger gave birth to twins. According to the zoo, they are third-time parents — with the previous births also having been twins. According to New Scientist, some 80% of tamarin births are fraternal twins.

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Two days later, on February 3, the zoo’s black and white colobus monkeys, Kuruka and Pili, welcomed a baby of their own. The newest addition to the family is the younger sibling to Mkali and Kale. “Mom is keeping the little one close, but big sister Mkali is already eager to lend a helping hand in caring for the baby when mom Pili allows,” the zoo posted on Facebook.

On that same day, Bolivian gray titi monkeys Juniper and Biscuit gave birth to the first titi monkey in over a decade at the zoo.

“We have more baby news to share! Meet our Bolivian gray titi monkey baby – the first titi monkey born at the Zoo since 2012. … It’s too soon to tell if the baby is male or female yet, as the parents are keeping the baby close. When the little one isn’t nursing, you can spot them cozying up with dad Biscuit,” read a recent post from the zoo on Facebook.

It turns out February was a big month for primate births in North Texas. Not only did the Dallas Zoo welcome four babies, but Fort Worth Zoo announced Sekani, the gorilla, gave birth to Jameela.

Undoubtedly, the Dallas Zoo will be keeping a close eye on its new residents. As previously reported by The Dallas Express, the zoo has dealt with numerous security breaches over the past year, including the theft of two tamarin monkeys by a local Dallas man. As a result, the zoo has substantially stepped up its security measures, investing over $1 million in upgrades.