Dragon Book

The Dragon Book has gone through many changes over the years.

It can be found by tapping the book symbol in the upper left.
The numbers on top indicate number of dragons currently in the game.
- The first is how many unique dragons the player has including those in Kindergarten(s) and the Dragonarium.
- The second number is the total number of dragons currently viewable in the book in total. As new dragons are released they are sometimes given a number higher than this one stated
Each dragon is annotated with how it can be obtained:

Some dragons have more than one annotation
Some dragon orbs can be obtained in the the Missing Dragon Rescue feature, however this is not a filter option with the in-game book, and you only see the list by viewing the in-game feature or by reviewing each dragon.
- Dragons obtainable this way used to show the symbol, however this has now been removed, as it was not consistent
Dragons can have up to four elements, however the one that on the far left is its primary element.
The primary element can be used to work out a dragon's weakness, while the others indicate what moves it can learn. More information can be found here
The list of Elements are:

The list can be filtered by rarity and/or element by the options on the left, or sorted using the drop-down option at the top.
Dragons currently on sale or part of an event are listed at the start of the list.
Selecting an owned dragon that is in a Habitat or Kindergarten is equivalent to selecting it from one of those locations.
Selecting a dragon in the Dragonarium or an unowned dragon will bring up its info page.

There are numbers without a dragon.

Due to the ever-growing list of dragons, the list has been split to display in the below sub-pages.

Trivia

As of Jul 2015 the rewards, collections, and level distinctions were eliminated, resulting in a single list.
On 10 August 2015, coincident with Dragon Cards Packs being available on Mobile, the Dragon Book was updated to show that information.