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Cute sloth bear cubs make their debut at Brookfield Zoo

In January, two sloth bear cubs were born at Chicago's Brookfield Zoo. They spent their first few months of life in a maternity den with their mom, 10-year-old Hani.

This Wednesday, just in time for Mother's Day, the still-unnamed brother/sister duo finally made their public debut.

"Zoo guests will be able to witness one of the most intriguing behavioural traits of this species: a mother sloth bear carrying her young on her back. Rarely seen in other bear species, a cub riding on its mother's back is a regular mode of family travel. Hani will continue to carry her cubs until they are about a third her size," the zoo posted on YouTube.

According to zoo spokeswoman Sandra Katzen, sloth bears, which live only in southern Asia, are listed as vulnerable on the IUCN Red List of Threatened Species, with fewer than 20,000 thought to remain in the wild, including populations in India, Pakistan, Nepal, Bangladesh and Sri Lanka.

The cute siblings were the first successful sloth bear litter born at the zoo.