The dragons evolved from a poisensess monitar lizard. and dwell on every continent they evovled due to a mass extincton event wiping out many species of bird. Not much else I can say because thats about all there is to say.

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    $\begingroup$ Sorry, we expect you to give full details. As it stands your question is unanswerable apart for a "whatever you like" $\endgroup$
    – L.Dutch
    Nov 23 at 11:48
  • $\begingroup$ Please have a look at other highly-voted questions, like anatomically correct creatures or creature design, to better understand what is expected in order for us to be able to answer :) $\endgroup$
    – Tortliena
    Nov 23 at 17:42

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