What feature do Yellow-Eyed Penguins lack compared to penguins in the genus *Eudyptes*?

Answer

Elaborate crests or plumes

The head structure of the Hoiho is characterized by relative simplicity when contrasted with certain other penguin groups. Specifically, they do not possess the elaborate crests, long plumes, or complex facial masks that are characteristic features of penguins belonging to the genus *Eudyptes*, which includes species like the Macaroni or Fiordland penguins. The identification of the Hoiho relies instead on the unique configuration of its yellow eye-band and its overall head shape, rather than ornate headgear.

What feature do Yellow-Eyed Penguins lack compared to penguins in the genus *Eudyptes*?
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