When a farmer suspects livestock has been killed by an eagle, wherever possible, the Parks and Wildlife Service will organise post mortems. If a post mortem is not possible you can see if an eagle has attacked the lamb by skinning back the head and shoulders and examining the presence and degree of bruising. If the lamb was alive and active there should be considerable bruising where the claws penetrated. Make a realistic assessment of the possible damage. Submit carcasses to the Department of Primary industry and Fisheries or the Parks and Wildlife Service for examination.
Eagles are easily scared off by humans.
If possible, move stock closer to people. Goats especially benefit from this and provide some shelter for their kids. Scarecrows can work well if backed up by shooting to scare. If you do this, please remember, you must have a permit from the Parks and Wildlife Service, so you cannot be accused of shooting at the birds. Notify the Parks and Wildlife Service.