Multiple choice Which of the following is not a metatheria? Kangaroo Opossum Hedgehog Koala Bear Reveal answer Fill a bubble to check yourself C Correct answer Explanation 'Metatheria' includes the pouch bearing mammals such as kangaroo, opossum, koala and bear. They bear young ones, which are in immature state. The further development of young ones takes place in the abdominal pouch of the female known as marsupium.