Almost always one. Animals in the wild have been known to live up to 13 years. Captive animals can live up to 18 years. The overall appearance is much like a teddy bear. Males, at about 26 lbs., are larger than the 17 lb.
Males have a scent gland on the chest and females have a rear-facing pouch.
The koala is adapted to its almost exclusively arboreal life. The large paws have long claws for grasping tree limbs. The dense wooly fur, gray above and white below, makes the koala extremely difficult to see . Their 'hands' have two opposable thumbs and three fingers. The koala is mostly nocturnal and usually solitary.