When traveling to Australia, it is important to be aware of the items that must be declared upon arrival. These items include all food, plant material, and animal items. This is done to prevent the spread of pests and diseases that could be harmful to the local environment. Additionally, firearms, weapons, and ammunition must be declared to ensure the safety and security of the country. Furthermore, if you are carrying currency amounts of A$10,000 (or foreign equivalent), you must declare this as well. This is to prevent money laundering and other illegal activities. Finally, some medicines must also be declared to ensure that they are legal and safe for use in Australia. It is important to be aware of these regulations and to comply with them to avoid any issues during your travel.