the classics pages letters

I am trying to learn about the mythology of the salamander - I have found
two general interpretations -
one that it was an omen of bad luck, a second that was positive - that the
salamander was a mythical
beast that could survive fire.

What appears in Greek/Roman mythology?

A mythical lizard-like monster that was supposed to be able to live in
fire - which it put out with the chill of its body. Pliny claims to have
experimented - but the creature was burnt to ashes!