No scripts really, although I made use of some Mograph tools in C4D. The feathers are cloned along poly edges using random and step effectors and the pipe alike wireframe is done using the Atom Array module.
I'm pretty sure there are tons of similar ways of getting the same look with other tools or programs.
To tell you the whole story; when I did the cat piece there was a crow in the concept at first, then a vulture and only then a cat because my gf wanted so. However I did a low poly pre-viz version of a raven before the cat. Then later on in piece 291 I refinded the raven model but it was still very low detail.
Then I scrolled trough my works and kinda got re-inspired to render the first intended raven like in the cat piece, but I found it to be boring to use the exact same technique so I chose straight wire connections instead of branches.