This is the first monster replacement model
It was released by Andrew Joll way back at Qexpo 2005: 
http://qexpo2005.quakedev.com/booths/randy/148.html

There are 3 different versions flying around on the internet today:
- the original by Andrew Joll, which is very bright and has little blood.
- a modified with very dark blood and almost black mouth, hands and feet.
- THIS one: It has a darkened fur compared to Andrews and slightly more RED blood.


The filenames have been modified to work with DarkPlaces out of the box.
Simply put the .pk3 file into your Quake/ID1 folder. Thats it.

For any other engine, please refer to engines readme, how to rename the files

Kind regards,
Seven