Which modern penguin species is mentioned to provide a size comparison for Waimanu?

Answer

Emperor Penguin

The Emperor Penguin, known scientifically as Aptenodytes forsteri, is the largest living species of penguin. It is used as a benchmark for size because it rarely exceeds four feet in height, serving to emphasize the impressive, larger scale of the ancient Waimanu manneringi.

Which modern penguin species is mentioned to provide a size comparison for Waimanu?
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