Three United Arab Emirates nationals have been arrested after security guards at India's capital airport found two of the men hiding slender lorises in pouches in their briefs, the BBC reported.

Security guards at Delhi's Indira Gandhi International Airport noticed a bulge in their underwear during a frisk and uncovered the nocturnal, carnivorous primates, according to the BBC report.

The men were traveling from Bangkok to Dubai when they passed through the airport, the BBC reported.

The lorises, which experts fear are becoming extinct, were in "OK, but deteriorating" condition, a customs official told the BBC. They were transferred to a Delhi-based organization, People For Animals, and are being treated.

Lorises are small primates that are native to parts of Asia, and they have recently become a popular exotic pet.