If you wish to keep any dragons but not necessarily have them out on your Berk (or if your Berk is full), you can store them in your Hangar. You can find the Hangar south of your Meade Hall, near the Academy.

 

 

The Hangar can hold up to 70 dragons by default, with the option to expand and get more spots by pressing the "+" button on the upper right-hand corner. However, any dragon that is purchased or acquired through Collections or Card Packs can be placed in the Hangar even if the Hangar is at its maximum capacity. The Hangar has special tools to help you sort through your dragons, such as search (by name or species), sorting, rarity filters, and a grid view.

 

 

Dragons stored in the Hangar cannot collect resources for you. They can be fed and trained as normal while inside the Hangar but will need to be outside in order to undergo Titan Training. You will also have the option to move them to your Berk or release them if you wish to do so. While the Hangar is full or above capacity, it is not possible to train or feed your Dragon.