Related Clues:
- Extinct ''Wonderland'' bird
- Another dunderhead
- Pigeon's erstwhile kin
- Bygone Mauritian bird
- An Einstein he's not
- Wonderland creature
- No deep thinker
- Thickhead
- Long-extinct bird
- Extinct bird of Mauritius
- Bye-bye birdie?
- It became extinct less than 100 years after its discovery
- Mental midget
- Space cadet
- Bygone avian