Thanks to Murray Clark aka muzz64 who shared this Model

https://www.thingiverse.com/thing:1532944

'RATZ' are a fun print that can become quite addictive. it's all to easy to end up with a 'RATZ' infested house. There are two options provided. The 'Biting RATZ' file opens the mouth when you left the tail and, printed well (with 3 shells / 50% infill or more), has a good bite!

The 'RATZ' file is a static model with no moving parts. This file can be printed with 2 shells and 10 - 15% infill as it doesn't need the strength required for the 'Biting RATZ' file to make it springy and strong.

At standard size "RATZ' are approx. 85mm tall. They print great in PLA on Makerbot's (as the images show). They should print well in PLA on most well set up accurate machines. However, the design use extreme angles that will be a challenge for ABS. Please also note that some slicing apps and machines may find the fine tolerances / angles / detail challenging. No support required.

'RATZ' are fun... if you print one you'll end up printing lots. The designs have been test printed lots of times to refine them (as the images show)... so get started and infest your house / office / car with some 'RATZ'.