Okay, here are a few options for the WordPress post tag description “鳥類起源” (Bird Origins) in Traditional Chinese, catering to different levels of detail and formality:

**Option 1: Concise and Direct (Suitable for general use)**

* 繁體中文：探討鳥類的演化歷史和起源。

* *Translation:* Exploring the evolutionary history and origins of birds.

**Option 2: More Descriptive (Adds a bit more context)**

* 繁體中文：深入研究鳥類，從恐龍到今日鳥類的演化歷程，以及相關的化石證據和科學研究。

* *Translation:* Delving into the study of birds, from dinosaurs to the birds of today, including related fossil evidence and scientific research.

**Option 3: Focusing on Scientific Discovery (Suitable for a blog with a scientific bent)**

* 繁體中文：解開鳥類起源之謎，探索最新的科學研究和化石發現，揭示鳥類演化的關鍵環節。

* *Translation:* Unraveling the mystery of bird origins, exploring the latest scientific research and fossil discoveries, and revealing the key links in bird evolution.

**Option 4: Simple and Engaging (For a more accessible blog)**

* 繁體中文：認識鳥類的祖先，了解牠們是怎樣演化而來的！

* *Translation:* Get to know the ancestors of birds and understand how they evolved!

**Option 5: Emphasizing the “Why”**

* 繁體中文：探索鳥類起源的奧秘，探究牠們在地球生命中的重要性。

* *Translation:* Explore the mysteries of bird origins, and investigate their importance in the life on Earth.

**How to Choose:**

* Consider your blog’s audience. Are they primarily scientists/academics or a general audience?
* Think about the content you’ll typically be tagging with this tag. Choose a description that best reflects the focus of those posts.
* Keep it relatively concise (within a few sentences) for good usability.

I recommend picking the option that best suits the tone and focus of *your* blog. I think options 1, 2 or 5 are probably the most versatile. Good luck!