tree squirrel

NOUN /tri_'skwɜrəl/
13 LETTERS · STARTS WITH T

tree squirrel is a valid 13-letter word worth 21 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1R1E1E1S1Q10U1I1R1R1E1L1
1 + 1 + 1 + 1 + 0 + 1 + 10 + 1 + 1 + 1 + 1 + 1 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does tree squirrel mean?