Here are a few options for the WordPress post_tag description, ranging from simple to more descriptive, all in Traditional Chinese:

**Option 1 (Simple & Direct):**

> 描述：冬季遷徙來台的鳥類。
>
> (Description: Birds that migrate to Taiwan in winter.)

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

> 描述：冬季來訪台灣的候鳥，包括各種種類的鳥類，是觀鳥愛好者不可錯過的景象。
>
> (Description: Winter migratory birds that visit Taiwan, including various types of birds, a must-see for birdwatching enthusiasts.)

**Option 3 (Focus on the Seasonal aspect):**

> 描述：每年冬季來台度冬的候鳥。觀賞牠們是冬季觀鳥活動的重頭戲。
>
> (Description: Migratory birds that come to Taiwan to spend the winter each year. Observing them is a highlight of winter birdwatching activities.)

**Option 4 (More Detailed and Keyword Rich):**

> 描述：冬季來台度冬的候鳥，包括各種雁鴨科、鷸鴴科、猛禽等。了解牠們的生活習性、遷徙路線和在台灣的分布。
>
> (Description: Winter migratory birds that spend the winter in Taiwan, including various species of waterfowl, shorebirds, birds of prey, etc. Learn about their life habits, migration routes, and distribution in Taiwan.)

**Option Breakdown & Recommendations:**

* **Simplicity:** The best option depends on the overall context of your blog. Option 1 or 2 is often sufficient for a quick and clear understanding.
* **SEO:** If you want to optimize for search engines, Option 4 incorporates relevant keywords (“雁鴨科”, “鷸鴴科”, “猛禽”, “遷徙路線”) and could improve the post_tag’s discoverability.
* **Target Audience:** Consider who will be viewing your website. Will your audience be bird enthusiasts? Then Option 4 might be a good choice. Are you aiming for a general audience? Opt for the simplicity of Options 1 or 2.

**How to set the description in WordPress:**

1. **Add or Edit the Tag:** Go to “Posts” -> “Tags” in your WordPress dashboard. Create a new tag with the name “冬候鳥” or edit the existing one.
2. **Find the Description Field:** The description field is usually found below the tag’s name field. (If it’s not visible, you may need to enable it in the “Screen Options” at the top of the Tags/Categories page).
3. **Paste your Chosen Description:** Copy and paste your chosen Traditional Chinese description into the “Description” field.
4. **Save.**
The description appears in your wp-admin panel with no visual impact on your front end. Themes may style their use, though. Search engine optimization will likely see this as a snippet to associate with the tag.