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.
Ele estava um bocado nervoso quando  a estava a contar, mas disse-me que, quando um pinguim encontra um parceiro  com o qual quer passar toda a vida, oferece-lhe uma pedrinha, a pedrinha perfeita.