User blog comment:Nyastara/Release - Happy 6th Birthday DC!/@comment-3173171-20120523115354/@comment-3173171-20120616054559

There are no limits to how many dragons you can keep on your scroll but there is a limit to how many eggs and unfrozen hatchlings you can hold at one time. The base limit is four eggs and eight hatchlings, this changes with the increasing amount of dragons on a users scroll and their following trophy level:

Previously, there was no benefit to badges, and you could have 4 eggs/8 total. Plus, you could breed a fifth egg making it 5 eggs/9 total.

"4 eggs/12 total dragons" means you can hold 4 eggs and 8 hatchlings or only 12 hatchlings. This has no influence on the adults on your scroll, but until you get your bronze trophy, by collecting and nuturing 50 dragons to adulthood, you can't hold more than the 4 eggs.