The Slender-billed Curlew is nowadays considered extinct  with no birds officially observed in the last nearly 20 years or so worldwide (Corso  et al 2014  Kirwan  et al2015)  while the Bald Ibis seems to be recovering with a rather small but increasing wild breeding population in Morocco (though the other wild very small one from Syria is gone forever) and some reintroduction projects elsewhere around Europe or “feral” populations (Spain  Austrian and Italian Alps  Turkey)