 The Réunion ibis or Réunion sacred ibis ( Threskiornis solitarius ) is an extinct species of ibis that was endemic to the volcanic island of Réunion in the Indian Ocean . The first subfossil remains were found in 1974 , and the ibis was first scientifically described in 1987 . Its closest relatives are the Malagasy sacred ibis , the African sacred ibis , and the straw @-@ necked ibis . 
 The Réunion ibis or Réunion sacred ibis ( Threskiornis solitarius ) <a href='drop_aux' title='1'><mark>is</mark></a>an extinct species of ibis <a href='null_relcl' title='2'><mark>that</mark></a>was endemic to the volcanic island of Réunion in the Indian Ocean . The first subfossil remains <a href='uninflect' title='3'><mark>were</mark></a> found in 1974 , and the ibis was first scientifically described in 1987 . Its closest relatives are the Malagasy sacred ibis , the African sacred ibis , and the straw @-@ necked ibis . 
The Réunion ibis or Réunion sacred ibis ( Threskiornis solitarius ) an extinct species of ibis was endemic to the volcanic island of Réunion in da Indian Ocean . Tdafirst subfossil remains was found in 1974 , and the ibis was first scientifically described in 1987 . Its closest relatives r thdaalagasy sacred ibis , the African sacred ibis , and thedaraw @-@ necked ibis .