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Why is a stingray not considered a mammal?

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Wait really? Another one of Pesek's students on Quora. A stingray is a fish… it's in the class chondricchteyes meaning it has a skeleton made entirely of cartilage. read more

Some scientists have the theorie that the stingray is not considered a mammal because it’s a fish. But you may have information that we miss. If you manage to take a snapshot of a stingray breastfeeding her youngs could become really famous mate. read more

Both are characteristics mammals have. What is strange is that stingrays give birth to their offspring similar to the way us humans give birth. The stingray has live young inside embryos that reside in the womb, feeding on a yolk sac. read more

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