How to breed a Poo Dragon?

I'm almost complete in my Monstrous Collection except that I can't breed a Poo dragon yet. I'm always trying to get it using a Dark and Mud dragon but it has a sad result always, at least on my experience. Dragon City enthusiast, please help me!

Breeding a Plankton Dragon - Simple at No Cost

Plankton Dragon

Did you know that I was able to breed a Plankton Dragon without researching it first in the DEUS' Vault?

My goal at first is to get a Waterfall Dragon by breeding Terra and Sea Dragons is order to complete my Blue Planet Collection of Dragons. After 5 tries, I noticed that the breeding time took longer that expected and it resulted to a Plankton Dragon.

I then open the Deus' Vault to check if this is the one the needs to be researched first with 200 gems. I confirmed it is.

If you want to get a Plankton Dragon, just breed Terra and Sea dragons. You may not get it during first three tries, just keep on trying until you get it. Please note that breeding these two dragons will give short breed time except if it is already a Plankton dragon.

If you have other ways to get specials dragons or on this blog entry, feel free to leave a comment.