It's not always the big things that should attract your attention. Chris Packham looks at a cowpat which is covered in dung flies. They are not as common as they used to be, because mainland farming processes are quite intensive, but it is less so on Rathlin Island. A dung fly's whole life revolves round a single patch of dung. They'll fight for it, breed on it, lay their eggs in it and their larvae will feed on it. You can watch all sorts of behaviour as new males arrive. And as flies go they are quite appealing - ginger, fluffy and cuddly - like little teddies.