Make your Gruffalo sons birthday extra special by buying this personalised birthday card.Â This vibrant card features Gruffalo and Mouse who are the famous characters from the Gruffalo Children book series. The message on the front of the card reads 'To a Super Son ... Happy Birthday.' This cover is bright blue with faint stripes and has the mouse hanging from the caption and the Gruffalo pointing up at theÂ birthday message! The Gruffalo books written by the author, Julia Donaldson have been young children favourites for the last 20 years.Â With over 13 million books sold children and adults continuously read the adventures of the Gruffalo and his friends.