When RSPCA Come always have a camera ready and a voice recorder and take lots of photos of them - it is your right. Do not take any notice of them when they tell you that you cannot take photos or record them. It is your property they are on. They lie in court and fabricate evidence - you will need these photos and voice recordings for your legal protection - do not let them defeat you with their fabricated stories and perjury.
RSPCA, under the Animal Care and Protection Act can steal your evidence. If they are coming lock up your records in your car boot or elsewhere. When you go to court you will have lost your evidence and witnesses, the only evidence will be the lies and fabrications RSPCA present. When you see them rub the chicken into dirt and hold it up to the camera, take photos of them doing it.
Imagination Television "RSPCA Animal Rescue" film crew go with RSPCA Inspectors onto people's propeties pretending to be RSPCA collecting evidence. You have rights. Tell them they are not to come onto your property to film. If they do they have then caused a tresspass. In Queensland DPI&F contract the Administration of the Animal Care and Protection Act to RSPCA. This contract specifically states RSPCA are not to bring media with them.
When the defamation begins after their raid and the photos they took appear on the Internet and in newspapers remember to make them pay. Invasion of Privacy Act has criminal penalities so push the Police to charge them or put the evidence together and pass it to the Director of Public Prosecutions and go public wit hit. Find someone who knows a bit about the law and how to do it yourself. The legally most powerful person in the system is the self represented - they have unlimited legal resources compared to RSPCA and others who have to use lawyers.