Beware of sheep, they will have a nice rub on the helicopter when you are not looking, to the front, to the sides and underneath the helicopter. In the process they will dislodge and break things off. Cattle will lick the helicopter and abraid the paintwork, and if they have a rub you are well and truly finished. Horses will be inquisitive and come over and start to scratch the paintwork and perspex with their teeth. I had an insurance claim on a vehicle because the horse actually reached over the gate and scoured the bodywork and the glass windscreen with its teeth. If you leave a helicopter in a field with any livestock you really must fence it off to stop them getting anywhere near it when you are not there. Farm electric sheep netting is good, but make sure it is properly taken down and moved away before you depart. .... I speak from experience!!