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I just realized the bird turns it's head to follow the mouse pointer.

Yes, and the animation is made using an interesting technique that I can't immediately figure out.

For example, what is this [0] or this [1].

The code is not obfuscated and seems well documented [2]. Maybe, I'll read it later or have an agent explain it to me.

[0] kind of looks like a 1D cellular automaton running inside a voronoi diagram. With a green blob overlaid on top.

Also, you can ruffle its feathers with the mouse.