snake Rig and Animation

Hello to everyone,
I am trying to create a snake animation, I am new to rigging and animating stuff so i have no idea about how to make the snake grows or increase in length. My mind says its very simple but i don’t know how to do it…
Any suggestion or ideas will be helpful

Thanks in advance

Hi. Here is a one link for video tutorial of a snake modelling , rigging, texturing and animating by 999000999000999000.

thank for replying… but this is regular snake… i want these kind of slither game snake animation here the snake length is increasing after it ate something…
Thanks in advance
Any ideas plz