From the publisher:

The Croods takes us back to the beginning, to a previously undiscovered era known as the Croodaceous period, a time when Mother Nature was still experimenting and the animals, flora and fauna we know today hadn't evolved yet. Trying to find their evolutionary niche are The Croods, a family who must adapt to survive after their cave home is destroyed.

The Art of The Croods traces the evolution of the comedy adventure movie with over 400 pieces of concept art, character sketches, storyboards and digital paintings, along with interviews with the key animation talent.