Presenting the CornCobMod or the CornCobMan's FunMod (I'm really creative and original with names you see).
This is an add-on to make the Fun Mod compatible with the 0.5 beta 2 release of the Tyranids mod. You need to install the Tyranids mod first to use this add-on.
Are you sure the type of this download is an "Animal Model"? Or is this an infestation of your creativity? xD
One serious question: Is this only an add-on to add the tyranids to CCM or does it modify the gameplay as well?
There isn't an appropriate category available that closely matches the type of add-on this is so I just choose one at random. :P.
The gameplay is slightly different, in that Carnifexes have vehicle armour and have ranged resistance, Lictors execute troops on 25% health or lower and Toxic Miasma isn't available on most buildings straight away, you have to research it. There are also some tweaks here and there that I can't remember the details of.