How to move an icon through different points?

This website has an excellent animated map showing the migration patterns of wildebeest in the Serengeti. Unfortunately, they animated their map using Flash.

I wanted to know whether there were alternatives for doing something similar, perhaps with Javascript. I found a plugin called Two.js however the documentation isn't great and it seems to be a bit overkill for what I need.

Does anyone know of any good resources or examples they could kindly link me to?