Walter R. Brooks 
Freddy and the Popinjay [EPUB ebook] 

Published over a 40 year period, the 26 classic books about Freddy the Pig have delighted five generations of children, and they are now going on to delight a sixth generation. When J.J. Pomeroy, the robin, almost pulled off Freddy’s tail, thinking it was a worm, Freddy decided to transform the robin into a popinjay. This starts a series of transformations—some of which may be a big mistake.