Therefore, how they came to be called 'pigs' is not clear. They are built somewhat like a pig, with a large head relative to the body, a stout neck, and a rounded rump with no tail. Some of the sounds they emit are very similar to those made by pigs, and they spend a large amount of time eating. They were transported to Europe by ships. This was possible because guinea pigs did well in small spaces, therefore they survived the long trips.