ขน
Acknowledgements
Image source
https://pixabay.com/th/photos/%E0%B8%97%E0%B8%B5%E0%B9%88%E0%B8%99%E0%B9%88%E0%B8%B2%E0%B8%AA%E0%B8%87%E0%B8%AA%E0%B8%B2%E0%B8%A3-%E0%B8%9C%E0%B8%B4%E0%B8%A7-%E0%B8%9C%E0%B8%A1-tautropfen-%E0%B8%AB%E0%B8%A1%E0%B8%AD%E0%B8%81-55513/