The platypus does not develop a pouch, it deposits eggs into a nest. The female then incubates the eggs by curling around them and nurses the young in this same manner when they hatch. Marsupials are pouched mammals. Young are born underdeveloped. They complete the development process externally, attached to a nipple in the female's pouch or in some cases, deep folds of skin on the female's abdomen.
Placental animals develop internally attached to their mothers by an umbilical cord.
Find the Australian animals in the above puzzle. Next to each, indicate if it is a monotreme, marsupial, or placental animal. Some estimate that 13 species of mammals and one bird have become extinct since European settlement, but many more are in peril. Foxes and cats prey on native species such as opossums, bandicoots, birds, and lizards. Rabbits, sheep, and cattle overgraze native plants and grasses.