Talk:Game Updates/@comment-27375592-20160721223946/@comment-27921111-20160722025429

The blue heart button on a dragon's infobox shows if the dragon is your "chosen dragon" for the cooperative breeding cave. Your chosen dragon is the dragon that your friends can use to breed in the coop cave, and it is also the dragon selected by default when you want to breed in the coop cave. It is a generally helpful tool for people who use the coop cave frequently.

If the heart is blue, it means the dragon is selected for cooperative breeding, meaning that that is your "chosen dragon." If the heart is grey, that means that dragon is not selected as your chosen dragon. Clicking on the button when it is grey will set that dragon as your chosen dragon. Clicking on the button when it is blue will not change the chosen dragon, it will only display a pop-up message about cooperative breeding. You must click the heart button on a different dragon's infobox to change it.

Hope I helped! :)