Birthday Dragons, with Spoilers

[krait]

Let's have a post for working out the mechanics of obtaining all the new eggs! I've been editing my initial post a bit, but then I thought it might be better to have an official "here be spoilers" post for anyone who prefers to work things out for themselves.

( SPOILERS and speculation below! )

Where possible I've linked dragons I produced myself as confirmation of breeding/mechanics. Share your discoveries, experiments, failures, and successes in the comments if you're interested in working out these new challenges.

Market question

[unbroken_halo]

One more question...for now. LOL! What is the trigger to unlocking the eggs in the market? I know it is tied to the encyclopedia, but what exactly does that entail? If the dragon is no longer shadowed on my encyclopedia, should it be unlocked in the market as well? Does each image need to be visible for the market egg to be unlocked? Thanks in advance for any help?