WHAT IS IN THE DECEMBER THAT MAKES IT UNIQUE FROM OTHER MONTH RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

A coffin Did you answer this riddle correctly?
YES  NO  

The letter 'R'

Once in a YEAR

Twice in a month: FEBRUARY

Thrice in a week: SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY

4-times in a day:
ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, ELEVEN, TWELVE {A.M.}
ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, ELEVEN, TWELVE {P.M.} Did you answer this riddle correctly?
YES  NO  

February, it's the shortest month after all. Did you answer this riddle correctly?
YES  NO  

All of them. Did you answer this riddle correctly?
YES  NO  

August is a town. Did you answer this riddle correctly?
YES  NO  

May Did you answer this riddle correctly?
YES  NO  

Sept-timber. Did you answer this riddle correctly?
YES  NO  

Baby giraffes! Did you answer this riddle correctly?
YES  NO  

All of them Did you answer this riddle correctly?
YES  NO  

February, because there are fewer days. Did you answer this riddle correctly?
YES  NO  

Nine Did you answer this riddle correctly?
YES  NO  

November Did you answer this riddle correctly?
YES  NO  

John Albert "L.A." Burr Did you answer this riddle correctly?
YES  NO  

Phil Brooks, the disposable needle Did you answer this riddle correctly?
YES  NO  

The elevator. Invented by Alexander Miles Did you answer this riddle correctly?
YES  NO