We're going to get through this, together.
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Yes, but one is a bird. Archaeopteryx is classified as an Aviala, which is the group of birds. It is generally described as the first bird.
This is fascinating. Thank you. My confusion then: dinosaurs, as a classification, what does it mean when we say 'dinosaurs'
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Well, Dinosauria is an actual group of animals which includes everything that is usually regarded as a dinosaur like Tyrannosaurus or Triceratops. Its main diference with their relatives is that they maintain a "mammal-like" posture with their legs under their body.
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To be clear. Pteranodon is not a dinosaur as it doesn't cualify for everything and neither are the marine reptiles of that era such as Mosasaurus (that one in particular was an actual lizard).
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