Board Thread:Dragon City Gameplay Questions & Answers/@comment-24637496-20140308155607/@comment-11132490-20140309024746

No, the idea is if you have the breeding tree and the breeding mountain, then you can breed 2 pairs at the same time. This will save you alot of time, for instance, if you are trying to get a soccer dragon then it might take a month of testing out combos to finally get it, with 2 breeding structures, you can do it in half the time. The high level hatchery is for all the eggs that come in from breedings, so you don't run out of space for eggs.