Talk:Game Updates/@comment-89.211.58.141-20130107132018/@comment-87.207.231.63-20130107155544

http://www.2084.org/dragonvale/breeding-sandbox/

You'll find all the answers here. Click on the "Combo Finder" tab and try dragons in the cave or island. You'll see that some vary considerably (Gem dragons are a 7% chance in the island and 3.5% in the cave) where as many limited dragons don't vary (they will often be 10% chance in either).