There is a save button in the top left corner, give your creature a name to save it. Then you can click on the drop down menu on top to load it again.
oops sorry i had worded it a bit poorly, haha, i meant, where are the creature saves stored on the computer? im trying to share my creature saves
The files are saved here: C:\Users\USERNAME\AppData\LocalLow\Keiwan Donyagard\Evolution\EvolutionSaves
