Cats in Fukui "Yawn"

I went to a Zen temple in Echizen City, which has become popular as a cat temple
because it was featured on a national TV show lately.
The parking space was full and many visitors enjoyed looking the cats or taking photos.
But the cats don’t care and play always freely.
And a cat couldn’t stop yawning in such pleasant weather.
I have heard that a yawn is primitive reactive behavior for animals.