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Platypus - Wikipedia
Why Is the Platypus a Mammal? | Britannica - Encyclopedia Britannica
Platypus | Eggs, Habitat, Venom, & Facts | Britannica
Monotreme - Wikipedia
Why is the platypus a mammal? | Britannica - Encyclopedia Britannica
Is a Platypus a Mammal? - WorldAtlas
Is the Platypus a Mammal? - Amazing Platypus Facts That
Are platypuses mammals? - A-Z Animals
Platypus | National Geographic
What is a platypus? - NOAA's National Ocean Service