\_\_\_\_, the Mauritius parakeet, and the Japanese crested ibis are among the most endangered of the world’s birds.

"The Marianas mallard" 為名詞片語，與後方的 "the Mauritius parakeet" 及 "the Japanese crested ibis" 詞性相同，完美構成 "A, B, and C" 的並列主詞平行結構。