Assertion: marsupial | /r/HasProperty | about 250 species
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Source sentences:
text: To date, most marsupials have become extinct and now there are about 250 species.
text: Marsupial, any of more than 250 species belonging to the infraclass Metatheria (sometimes called Marsupialia), a mammalian group characterized by premature birth and continued development of the newborn while attached to the nipples on the mother’s lower belly.