There are many reasons to protect endangered animals. Here are some of them in English:1. Biodiversity: Protecting endangered animals helps maintain biodiversity on Earth. Biodiversity refers to the complex interactions between species of organisms and between them and the environment, forming a complex and fragile ecosystem. If we allow certain species to go extinct, this could have an irreversible impact on the entire ecosystem.2. Food chain: Animals play an important role in the food chain. When one species goes extinct, others in the food chain can be affected and even face their own extinction. Protecting endangered animals helps to maintain the balance of the ecosystem.3. Ecological services: Ecosystems provide many services that are beneficial to humans, such as providing food, water, climate regulation, etc. Protecting endangered animals helps to maintain these ecological services and ensure the sustainable development of human society.4. Ethical issues: Humans have a responsibility to protect animals that are endangered by our activities. Our actions, such as habitat destruction, overhunting and pollution, take a huge toll on these innocent lives. We have a responsibility to take action to provide them with a safer and more suitable environment.5. Human interests: Protecting endangered animals also helps to protect human interests. For example, the medicinal value, economic value and scientific research value of some endangered animals have important contributions to human society. To protect these animals is to protect our own interests.Therefore, the protection of endangered animals is of great significance to maintaining ecological balance, protecting ecological services, promoting sustainable development, and improving human well-being.保护濒临灭绝的动物的原因有很多，以下是其中几点用英语回答的原因：

1. 生物多样性：保护濒临灭绝的动物有助于维持地球上的生物多样性。

生物多样性是指生物种类之间以及它们与环境之间的复杂相互作用，形成了一个复杂而脆弱的生态系统。如果我们允许某些物种灭绝，这将可能对整个生态系统产生不可逆转的影响。

2. 食物链：动物在食物链中扮演着重要的角色。当一个物种灭绝时，食物链中的其他物种可能会受到影响，甚至面临自己的灭绝。保护濒危动物有助于维持生态系统的平衡。

3. 生态服务：生态系统提供了许多对人类有益的服务，例如提供食物、水源、气候调节等。保护濒危动物有助于维护这些生态服务，确保人类社会的可持续发展。

4. 伦理问题：人类有责任保护那些因我们活动而濒临灭绝的动物。我们的行为，例如破坏栖息地、过度捕猎和污染，对这些无辜的生命造成了巨大的伤害。我们有责任采取行动，为它们提供一个更安全和更适宜的生存环境。

5. 人类利益：保护濒危动物也有助于保护人类自身的利益。例如，一些濒危动物的药用价值、经济价值和科学研究价值对人类社会具有重要贡献。保护这些动物就是保护我们自己的利益。因此，保护濒临灭绝的动物对维护生态平衡、保护生态服务、促进可持续发展、提升人类福祉等方面都具有重要意义。