This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

The Philadelphia Zoo has just announced the arrival of 2 new baby Sloth Bear Cubs.

The cubs were born on January 2nd to 10-year-old mom Kayla, and 10-year old dad Bhalu.

Kayla and Bhalu

The zoo says Kayla has been showing great maternal behavior and has been in constant physical contact with the infants since birth.

Over the last four years, this has been only the second successful birth of Sloth Bear cubs and this is the first and only pair of cubs born in the more than 30 years.

“We are thrilled to start off 2023 with these successful births,” said Philadelphia Zoo Curator of Carnivores and Ungulates Maggie Morse. “This was a collaborative effort from both our expert keepers and our veterinary team. Kayla has been trained by her keepers to do voluntary ultra sounds so we were able to keep the SSP updated with news of a successful pregnancy.”

If you want to see the cubs, the zoo says you’re going to have to wait a few months until April when Kayla decides it’s time for them to go outside.

The sex of the cubs has not been determined yet and at this moment they haven’t been named.

“Philadelphia Zoo is proud to participate in the Association of Zoos and Aquarium’s Species Survival Plan (SSP) for the threatened sloth bear,” said Philadelphia Zoo Vice President of Animal Well-Being Rachel Metz. “We are looking forward to sharing the developmental milestones of these amazing bear cubs with our guests.”  

Facts about Sloth bears:

  • Sloth bears are found in the lowland forests of India, Nepal and Sri Lanka and are listed as vulnerable by the International Union for Conservation of Nature (IUCN) with populations decreasing dramatically in recent decades due to habitat loss, human-wildlife conflict and poaching.  
  • Sloth bears have several distinctive features and behaviors. They have flexible snouts with protruding upper and lower lips and powerful lungs that allow them to dislodge and eat termites and ants that are 8-10 feet underground. They can voluntarily close their nostrils to make sure no insects enter their nose. Aside from insects, sloth bears eat fruits, flowers and honey.
  • They also have long, dark shaggy fur with a distinct, cream-colored “U” or “Y” shaped marking on their chests.
  • Adult males can weigh between 175-310 lbs.  Females are smaller and weigh 120-210 lbs.
  • A typical gestation for sloth bears is 6-7 months. Like other bear species, sloth bears have delayed implantation, meaning that the fertilized egg does not attach to the uterine wall and start developing right away, and that delay is variable.  
  • Sloth bears are small at birth, weighing only about a pound and are essentially helpless, relying completely on their mother for care. Mom will typically care for young for several months in a sheltered den before the cubs begin to emerge.
  • Cubs can begin walking on their own at about a month old.
  • At around 3-4 months, mom and cubs will emerge from the den, and unlike any other bear species, cubs will ride on mom’s back by clinging to her long fur!
  • Cubs will stay on mom’s back for about 6 months and nurse from mom for about a year, and remain with her for 2-3 years.
  • Father bears are not at all involved with infant care, or are even nearby in the wild.

Information provided by the Philadelphia Zoo