Unlike their human counterparts, penguins do not become engaged upon the gifting of said pebble. Marriage is not an institution among birds. Instead, the exchange of the pebble leads to a sex act or, as sciencey folks prefer to say, mating.
Now, these lady penguins may have fish breath instead of fishnet stockings, but it cannot be denied that they are exchanging their form of currency (albeit shiny rocks) for sex. Who shall rescue them from this life of promiscuity?
Richard Gere, won’t you please save the penguins?
Read more about penguins and pebbles here.