Here are a few options for a WordPress post_tag description for “動物壽命” (Animal Lifespan), written in Traditional Chinese, ranging in detail:

**Option 1 (Concise):**

> 探討不同動物的平均壽命。 Explore average lifespans of various animals.

**Option 2 (Slightly More Detail):**

> 關於動物壽命的相關文章，包括各種類動物的預期壽命，以及影響牠們壽命的因素，例如飲食、環境及基因。 Articles focusing on animal lifespans, including the estimated lifespans of different animal species, and factors affecting them, such as diet, environment, and genetics.

**Option 3 (More Comprehensive):**

> 此標籤彙集了有關動物壽命的資訊。 內容包括各類動物（從小型寵物到大型野生動物）的平均壽命，影響動物壽命的因素（包括飲食、基因、棲息地及生活方式），以及關於動物長壽和衰老的科學研究。 This tag collects information on animal lifespans. Content includes the average lifespans of various animals (from small pets to large wildlife), factors affecting animal lifespans (including diet, genetics, habitat, and lifestyle), as well as scientific research on animal longevity and aging.

**Option 4 (Focus on Practical Application):**

> 對於動物愛好者和飼主而言，探究不同動物的壽命至關重要。 此標籤提供關於各種動物的平均壽命、牠們的潛在健康問題，以及如何照顧牠們以確保牠們擁有健康長壽生活的資訊。 對於照顧寵物或了解野生動物，這都是有用的參考資料。 Exploring the lifespans of different animals is crucial for animal lovers and owners. This tag provides information on the average lifespans of various animals, their potential health issues, and how to care for them to ensure a healthy and long life. This is a helpful reference for pet care and understanding wildlife.

**Which option to choose depends on:**

* **The overall tone of your blog/website.**
* **How many posts will be tagged with “動物壽命”.** If you’ll have many, the longer, more detailed options might be better.
* **Your target audience.** Consider their knowledge level and what they’re most interested in.

Remember to also consider your SEO strategy and include relevant keywords. All of these options attempt to do that implicitly. You can also add a general English summary for SEO purposes, or duplicate the description in both languages.