So we have a variety of bodies and some which are of different sizes but there are none that are explicity small.
So introducing the Small Body type,
It would have the following stats:
+1 Speed
+1 Flying (only if it has wings)
+3 Stealth
+2 Scentless
+3 Heat Resistance
-1 Cold Resistance
+1 Camoflague
This body could be useful in making some sneaky small critters that avoid conflict.
The additional heat resistance for being small would be useful in very hot maps like