rara avis in terris, nigroque simillima cygno: An extremely rare bird, and very like a black swan (supposed not to exist). The first four words are often used ironically.
Simply Latin (and a bit of Greek)
rara avis in terris, nigroque simillima cygno: An extremely rare bird, and very like a black swan (supposed not to exist). The first four words are often used ironically.