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In some (but by no means all) species of marsupials, females develop a pouch or marsupium in which the young are nursed.
Their marsupium is well developed, opens to the rear, and contains only 2 teats.
A marsupium is present and opens to the rear.
Members of this family have a well developed marsupium that opens anteriorly.
The eggs are carried by the female in an open marsupium .
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