Once Calforn is discovered on Mars, the player will have the option to unlock Pluto for 10 gems, where

one will discover the Plutonian Giraffes.

The Plutonian Giraffes

Pluto Ground

Baby Girafoo > Girafoo > Baitail > MacAngela > Speeda > Plutozilla

Pluto Plains

Effarig > Zenraffe > Giraffork > Geminiraff > Girachnid > Skyraffe

Once Skyraffe is discovered, the Martian will return and ask for the Skyraffe in exchange for 50 diamonds. Once you have given it to the Martian, it will ask for another Skyraffe, in exchange for 50 diamonds.