Through gene editing technologies such as CRISPR-Cas9, it is indeed theoretically possible to manipulate the genetic characteristics of animals so that they exhibit specific characteristics, including toxicity. However, the use of this technology for military purposes involves many complex ethical, legal and biosafety issues. 1. **Technical feasibility**: Gene editing can be used to modify the biological characteristics of animals to produce toxins or other harmful substances. Scientists have mastered some technical means to manipulate the genomes of plants and animals, but achieving specific and controllable toxic characteristics remains a huge challenge, including ensuring that toxicity is predictable, controllable and does not have unexpected negative effects on ecosystems. 2. **Ethical and legal issues**: The application of gene manipulation for military purposes involves many ethical controversies, including respect for life and possible ecological damage. In addition, the international community has reached a series of agreements and conventions on the use of biological weapons (such as the Biological Weapons Convention), prohibiting the use of biological weapons. 3. **Safety risks**: The abuse of gene manipulation technology may lead to unforeseen consequences, including damage to ecosystems, threats to human health, and impacts on biodiversity. Therefore, the development and application of such technologies require a high degree of supervision and caution. In summary, although genetic manipulation technology may theoretically cause animals to exhibit toxic properties, its application for military purposes is not only technically difficult to achieve, but also faces ethical and legal obstacles, as well as safety risks.