Synonyms of rara avis

nounA rare or unique, and thus outstanding or unusual, person or thing; a rare bird.

• rarity
• black swanSomething believed impossible or not to exist, especially if an example is subsequently found; also, something...
• hen's toothAnything not naturally occurring.
• lightning in a bottle
• one in a millionSomething extremely rare or unlikely.
• rare birdAn unusual or exceptional person or thing.
• rocking horse shit slang, vulgarSomething exceedingly rare or, more likely, nonexistent.
• unicornSomeone or something that is rare and hard to find.