explanation needed

It usually goes something like this:

1. Red's nose goes on high alert and it gets real close to the ground
2. He finds a location in the grass and uses his little hands to dig a tiny hole
3. Red buries his nose in said hole
4. Then, this happens:





He'll just lay there and scoot-scoot-scoots his little body all over the place and get real wiggly. Why does he do this? Someone please explain.