A pair of lion cubs born Dec. 6 at the San Diego Zoo Safari Park cuddled Monday morning in their play area at the animal care center.

The brother and sister, whose mother, Oshana, wasn't giving them the attention they needed to thrive, are receiving bottles of kitten-starter formula every two hours from animal care staff.

Today the female cub weighed 3.5 pounds and the male cub weighed 5.5 pounds after their 8 a.m. feeding.

The cubs are viewable for short periods of time at the animal care center at the Safari Park, however, the cubs, like adult lions, are averaging about 20 hours of sleep per day. They will remain a pair and learn to be lions together. When they're ready, animal care staff will work on training behaviors that will help staff assess their health.