He was kind of a little bit nervous when he was sharing it with me, but he told me that when a penguin finds a mate that they want to spend the rest of their life with, they present them with a pebble -- the perfect pebble.
Era un po' nervoso mentre me la raccontava, ma mi disse che quando un pinguino trova il suo compagno della vita, gli regala una pietra: la pietra perfetta.