This is meant by falling literally flat on your face. This poor animal looks like he tripped himself up.
Is that Sid from Ice Age. Well, looking at the picture, he definitely seems to be because the poor animal just tripped on itself. The way he landed straight on his face brings that uncanny resemblance with one of the most favorite movie characters of modern times.
The only thing is to see if he has any friends who will help him in getting up or will be laughing at his position just like we are doing right now.