Are there any unique or special versions of meththa meditation? I have heard Lord Buddha has taught a special version of meththa for certain kind of creatures.

Can someone point reference to such a teaching in suttas?
There's the Ahina Sutta: By a Snake, which includes (I won't quote it all),


  I have good will for footless beings,
      good will for two-footed beings,
      good will for four-footed beings,
      good will for many-footed beings.  


It's previously mentioned in this answer, which quotes a note that says, "This is one of the few protective charms mentioned in the Pali canon and specifically allowed by the Buddha for monks to use".