Unfortunately for the observers, the four breeding pairs 'nesting sites were in amongst those of the greater crested terns, and under these conditions it was very difficult to distinguish how the appearance of their chicks might differ from that of greater crested tern chicks.
可惜的是，四對成鳥的棲息處與其他鳳頭燕鷗混雜，在那樣的環境中，很難分辨出黑嘴端鳳頭燕鷗的雛鳥外觀有何差別。