![A man takes photos of a cat during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)](http://www.ecns.cn/hd/2019/02/18/17a383a0391942318b35fae318543554.jpg)
A man takes photos of a cat during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)
![A cat is seen during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)](http://www.ecns.cn/hd/2019/02/18/b985efe3826e47fa94c9ff66683a2d29.jpg)
A cat is seen during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)
![A woman takes photos of a cat during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)](http://www.ecns.cn/hd/2019/02/18/245dd391cfbf4b66b2d825f9ed70eb2b.jpg)
A woman takes photos of a cat during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)
![A cat is seen during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)](http://www.ecns.cn/hd/2019/02/18/f2c78de2d9aa4fd89b9ee3aa96b01e65.jpg)
A cat is seen during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)
![A cat is seen during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)](http://www.ecns.cn/hd/2019/02/18/94394c9039154673925afdad58b20921.jpg)
A cat is seen during a cat exhibition in Warsaw, Poland, on Feb. 17, 2019. (Xinhua/Jaap Arriens)