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16 Weird Extinct Animals That Once Lived on Our PlanetDunkleosteus was a prehistoric fish covered in thick ... feature—its tusks curved downwards instead of upwards. These strange tusks were likely used for stripping bark or digging roots.
the alligator gar (which actually has a head like a spatula), is the largest exclusively freshwater fish species in North America, and we have tons of these strange prehistoric-looking monsters of ...
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