The World of Angry Birds Official Guide

The World of Angry Birds is a book released in 2013 published by Rovio Books and Puffin Books, is a Guide of Angry Birds and an activity book.

The book incluides information about Angry Birds, Angry Birds Seasons and Angry Birds Space.

Description
The book provides the following description:

Welcome to Piggy Island, home to the Angry Birds, Bad Piggies... and the mysterious Mighty Eagle.

In this Official Guide to the World of Angry Birds, Mighty Eagle takes you on a tour of the magical island, introducing you to all the heroes, villains and places.

Featuring interviews with the Birds and the Pigs, a history of famous feud and the stories behind Angry Birds, Angry Birds Seasons and Angry Birds Space.

Trivia

 * This is the first known source to mention King Mudbeard, even older than the Angry Birds Movie.