There were a lot of variations about walk or run cycle animation in past challenges, but there are plenty of other ways of animal locomotion we could explore.

This week we will animate snake's movement cycle in top down view. There are 4 major movement methods used by snakes I'm aware of:
1) Serpentine (Lateral Undulation);

2) Concertina

3) Sidewinding

4) Caterpillar (Rectilinear Method).

The forth one is not allowed in this weeks animation challenge, so you free to choose a type of snake movement you wish to animate with this one exception -  the Caterpillar (Rectilinear Method).

Do your research, find tutorials, pictures, videos to watch frame by frame, or use your imagination if you are confident or experienced enough to pull that off without any help, and help us break the walk/run routine.

Number of frames is open but it have to be a closed sequence that loops nicely.