No explanation, that is the name of this animal in Greek.

The common word for penguin is the one mentioned above. On the other hand, if you need the scientific name of the animal, it's "απτηνοδύτης". Both words can be found at the link provided below.

Hope this helps,

Alex

ο) ουσ. στεγανόποδο πτηνό των αρκτικών θαλασσών τρεφόμενο με ψάρια