Buy chocolate bars, or birds will take them

I believe this is a very subtle way of saying that Nestle bars are lighter than ever, as they are been "stolen" by some birds.
I think the idea is very poetic, as the birds are fluttering around.
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Creo que en este anuncio, Nestle a buscado una forma bastante sutil de promocionar que las nuevas barritas de Nestle de chocolate son tan ligeras que hasta los pájaros pueden cogerlas; También diría que es un anuncio bastante poético, por aquello de los pájaritos revoloteando.

I don´t know the advertisign agency yet, but if you know it, tell us!