@vonny,
How to explain laughing, a fox yawning. It's like breaking down why I laugh on falling down stairs (humans do this, there must be websites on it). I did fall down stairs, a lot of them one day in my early teens - I didn't know then about my peripheral vision, but I remember laughing. I didn't know until I was nearly fifty, but I suspected I was different. It turns out, people do tend to laugh immediately in these situations. A kind of release. Unless of course worse happens.
I've always sort of liked foxes. Sort of get them, as if I was a fox.
The photo of the wide open mouthed yawning fox did it, got me enjoying.