It is theoretically possible to design miniature wild animal species for viewing only by manipulating the breeding system of animals, but it involves many complex ethical, technical and ecological issues. 1. **Gene editing technology**: Modern biotechnology, such as CRISPR-Cas9, can be used to edit the genes of animals to adjust body size or other characteristics. However, this operation requires a deep understanding of the animal's genome and determining which genes affect body size and other desired characteristics. 2. **Artificial selection**: Through selective breeding, smaller individuals can be selected from generation to generation, which is a relatively traditional method. However, this requires a lot of time and resources, and may cause a decrease in genetic diversity and potential health problems. 3. **Ethical and animal welfare issues**: Manipulating animal breeding to meet human viewing needs may raise a series of ethical issues. The key is to ensure that the health and well-being of these animals are not harmed. 4. **Ecological impact**: The introduction of such ornamental animal species may have an impact on the ecosystem, especially if these animals accidentally enter the wild environment. Overall, this work must be strictly reviewed and regulated at the technical and ethical levels to ensure a balance between science and human needs and animal welfare.