Corks in a bottle

Corks in a bottle, originally uploaded by miquel_martin.

It's not everyday that you see a bottle filled with cork stoppers. The question however, is: didn't they have an extra cork to close the bottle itself?
PIcture taken in St. Emilion, France

PS: Please excuse my ignorance in advance, and if you know what that wooden stopper's used for, do enlighten me! :)

No cada dia veus ampolles plenes de taps de suro. La pregunta, pero és: de debó que no tenien un tap més per tancar l'ampolla?
Aquesta foto ha estat presa a St. Emilion, França

PD: perdoneu per anticipat la meva ignorància, i si algu sap qué és i com s'usa el tap de fusta, expliqueu-m'ho! :)

If you'd like some more info on this picture, there's a bunch of extra details in flickr.