The Bum Trilogy consists of three books by Australian author Andy Griffiths.
What Bumosaur Is That? is a children's book written by Andy Griffiths in 2007 as a companion to Bumageddon, describing many of the fictional prehistoric species mentioned in Bumageddon: The Final Pongflict.
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Bumageddon: The Final Pongflict (retitled Butt Wars: The Final Conflict in the U.S.) is the final book in Andy Griffiths' Bum trilogy, following The Day My Bum Went Psycho and Zombie Bums from Uranus.