Answer: dodo

AnswerCrossword Clue
DODOThickheaded one
DODONumskull
DODOExtinct bird, or birdbrain
DODODimwit
DODODing-a-ling
DODOKnucklehead
DODOBirdbrain, or extinct bird
DODOExtinct pigeon relative
DODOIgnoramus
DODOExemplar of extinction
DODOFogy or dullard
DODOClumsy extinct bird
DODOBird related to the pigeon
DODOBird clubbed to extinction
DODOJerk
DODOLong-extinct bird
DODONumbskull
DODOBoob
DODOOld fogy
DODONot-so-sharp bird
dodolarge, extinct flightless bird
DODOExtinct Mauritian
DODOOnce a bird
DODODunderhead
DODODumb cluck
DODOThis was a bird
DODONinny
DODODummy
DODOBlockhead
DODOLamebrain
DODODull-witted one
DODOExtinct bird
DODOBygone bird
DODOBirdbrain
DODOExtinct flightless bird
DODOFormer forest dweller of Mauritius
DODOBird on the Mauritian coat of arms
DODOFlightless bird of old
DODODoofus
DODOWonderland bird