Cow Watching

This is my last weekend in England and I'm staying at My brother's (TT) on the fens. We went out bird watching today but I stuck to cow watching as I'm quite fond of these large animals. They were very friendly and all nudged each other towards me. They tend to congregate along the sea wall-any explanations for that? I like any animal that has 4 stomachs; an attribute I can appreciate.