Sheep and cows, what's next? Advertisers continue to utilize farm animals to display ads in fields. This time it's for a Dutch Environmental campaign to protect Groene Hart. It's an area in the west of the Netherlands between Amsterdam and Utredht. The campaign is to protect the land from industry, roads and housing. The cows are wearing coats that read: I sign for the Green Hart. Do you sign too? Residents can also be photographed for billboards to show their support.