Here are a few options for the WordPress post_tag description, catering to different tones and levels of detail, all in Traditional Chinese:

**Option 1: Concise and Informative**

> 燕子習性， 探索燕子各種行為模式，包括築巢、覓食、遷徙及社會互動等。了解更多關於這些優雅鳥類的行為。 (Yànzi xíxìng, tànsuǒ yànzi gèzhǒng xíngwéi móshì, bāokuò zhùcháo, mìshí, qiānxǐ jí shèhuì hùdòng děng. Liǎojiě gèng duō guānyú zhèxiē yōuyǎ niǎolèi de xíngwéi.)
>
> *Translation: Swallow Habits. Explore various behavioral patterns of swallows, including nest building, foraging, migration, and social interaction. Learn more about the behavior of these elegant birds.*

**Option 2: Slightly more Detailed and Engaging**

> 深入研究燕子習性，包括牠們如何築巢、在哪裡覓食，以及牠們如何跨越大陸遷徙。這個標籤帶你探索燕子的生活方式，揭開牠們迷人的秘密！ (Shēn rù yánjiū yànzi xíxìng, bāokuò tāmen rúhé zhùcháo, zài nǎlǐ mìshí, yǐjí tāmen rúhé kuàyuè dàlù qiānxǐ. Zhège biāoqían dài nǐ tànsuǒ yànzi de shēnghuó fāngshì, jiēkāi tāmen mímén de mìmì!)
>
> *Translation: Deep dive into swallow habits, including how they build nests, where they forage, and how they migrate across continents. This tag takes you to explore the swallow’s lifestyle, revealing their fascinating secrets!*

**Option 3: Focused on Practical Information (if applicable to your content)**

> 燕子習性相關的觀察筆記，包括燕子的飼養、觀察燕子活動區域和辨別不同種類燕子。分享您對燕子的發現！ (Yànzi xíxìng xiāngguān de guānchá bǐjì, bāokuò yànzi de sìyǎng, guānchá yànzi huódòng qūyù hé biànbié bùtóng zhǒnglèi yànzi. Fēnxiǎng nín duì yànzi de fāxiàn!)
>
> *Translation: Observation notes related to swallow habits, including swallow keeping, observing swallow activity areas, and distinguishing different types of swallows. Share your discoveries about swallows!*

**Option 4: Simple & Direct (for beginners)**

> 關於燕子的所有事：築巢、覓食、遷徙等等！ 探索燕子習性。 (Guānyú yànzi de suǒyǒushì: zhùcháo, mìshí, qiānxǐ děngděng! Tànsuǒ yànzi xíxìng.)
>
> *Translation: Everything about swallows: nesting, foraging, migrating, etc.! Explore swallow habits.*

**Which one to choose:**

* Consider the overall tone and focus of your blog.
* Pick the description that best reflects the content you’ll be tagging with “燕子習性”.
* Use the length of the description to your advantage. Short and sweet is good for clarity, while a bit more detail can grab attention and improve SEO.

Remember to review the description for any typos before publishing. Good luck!