Cryptiic and I had an interesting conversation. Each of the following: Mammalians, Reptoids, Mechanoids and Insectoids will have a BONUS.

The bonus for MECHANOIDS is this:
-- [i]Mechanoids will not require to use the SURVEY option in order to know the amount of Inhabitable planets within an explored solar system[/i].

Bonuses for the other three are pending. Suggestions are welcome!

And if you are wondering why a Mechanoid wouldn't be able to inhabit every planet in a solar system -- this is more just a game mechanic. I guess you could if you wish, but there are certain planets that are viable for mineral exploitation and some would be deserts of sulphur dioxide, helium or magnesium oxide which are relatively pointless in substantial, civilization wide uses.