like title says... in my underground base I upgraded from Enderium to Ludicrite coils and suddenly there were bats spanning inside the turbines on the Ludicrite blocks. The turbine was assembled (Multiblock recognized or whatever you call it) and works perfectly with the bat inside, but... consider the poor animals.

wasn't an issue with the Enderium coils...
using 0.4.0rc11

It looks like enderium overrides if the units can spawn but ludicrite doesn't; from the ThermalFoundation GitHub's Enderium block's implementation

@Override 
public boolean canCreatureSpawn(EnumCreatureType type, IBlockAccess world, int x, int y, int z) {   
    return false; 
}