If you haven't read the User-Generated FAQ up above in the Res Discussion forum.I should warn you all that hoarding creatu eggs is no longer useful.
Because the eggs do rot.
All findable planets eggs will rot after a week of picking up.
Seasonals will rot in a year (like for the Easero eggs, they will rot around Easter time).
CS (Shaefu, Jahra, Aerix, etc) & Uldavi eggs do not rot at all.
If anything, all planet eggs will disappear within half a month of picking up.
You can't stop the rotting either. You can't prevent them from rotting. They will rot no matter where they are.
In case you don't know, yes, rotting means you lose the egg and it can no longer be hatched.
Though I heard there's a surprise for people who do let their eggs rot.
Just wait for an update about that. :3