EDIT: I added the "alien lifeforms" research and then recalled that there is also the "Alien Biology" topic. Do we need both?
Well. Depends on what you want.
ALIEN LIFEFORMS"We've interrogated the aliens. Their behaviour is like so-and-so and they organize their societies like so-and-so. This is what makes their minds tick...babbleon..."
ALIEN BIOLOGY"We've examined the physiology of the aliens. Their bodies functions like so-and-so. They breed/procreate like so-and-so. This is what makes their bodies tick...babbleon..."
PS!While we're on the subject. If ever somebody introduces new damageTypes (DT_11 etc), it would be nice with at least three different STUN-damageTypes.
DT_STUN - Biological. Works on humans and hybrids (better on humans, slightly worse on hybrids)
DT_STUN2 - Biological. Works on aliens and hybrids (better on aliens, slightly worse on hybrids)
DT_STUN3 - Electrical (EMP). Works on robotic/powered-mechanical enemies. AND on armours depending on an internal power-source. Such as Power Armour, Flying Armour, Juggernaut Suits, Stormtrooper Suits.
Now that I think about it, those new damageTypes could be implemented in regular OpenXCom, working with standard FMP as well (I hope).