The palm-sized nocturnal primates, currently housed at a quarantined section of the Zoo, were seized from a flier when he was smuggling them wrapped in a sock and hidden in his pocket and undergarments.
The zoo authorities are now planning to house them in an exhibit where they will be protected from rats and other pests as the species is susceptible to diseases.
"We are planning a glass enclosure like we have for birds, which will be made pest-proof to protect these sensitive animals," said Riyaz Ahmed Khan, curator of Delhi Zoo.
"They need constant watch in captivity, given their diminutive size, so we might be having an enclosure which would be few feet above the ground and filled with adequate vegetation to sustain these animals," Khan said.
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"The animals were kept in quarantine since October last year to ensure their safety and treatment. They have been showing a lot of activity at night, which is a good sign," a zoo official said.
The nocturnal Slow Loris, found primarily in the Southeast Asian jungles, is an exotic primate about the size of a kitten, with short ears, stumpy tail and large round eyes.