canebrake rattler

NOUN
17 LETTERS · STARTS WITH C

canebrake rattler is a valid 17-letter word worth 24 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
C3A1N1E1B3R1A1K5E1R1A1T1T1L1E1R1
3 + 1 + 1 + 1 + 3 + 1 + 1 + 5 + 1 + 0 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does canebrake rattler mean?