No.
Seahorses are fish, not mammals. Although the male seahorse has a brood pouch for carrying the eggs, this feature alone does not make the seahorse a marsupial.
A marsupial is a mammal.A deer is not a marsupial, which is a sub-group of the mammal classification. A deer is known as a placental mammal, or Eutherian.
An elephant is a mammal, not a marsupial.
An ibex is not a marsupial. It is a placental mammal.
A wallaroo is a marsupial.
A seahorse is a fish.
A mammal which is not a marsupial or a monotreme is called a placental mammal. There is no opposite to a marsupial. An animal is either a marsupial or it is not. Marsupial is the term given to any mammal of the order Marsupialia whose young are born in an immature state and continue development in the "marsupium" (or pouch).
A seahorse is a fish.
Yes, a wombat is a mammal and a marsupial.
A kangaroo is a marsupial mammal.
Neither. Possums, or at least true possums, which are found in Australia, are marsupials.
A "Marsupial".
The Tasmanian devil is a marsupial mammal. Specifically, it is a carnivorous marsupial, meaning it is a dasyurid.