4 Calling Birds: Christmas Countdown Sudoku Special

Today's Puzzle:

Is the 4th puzzle away from Christmas day with 4 Calling Birds to a 'tweeting' variant of the 12 Days of Christmas song.

P.S., another difficult puzzle mid-week. Hopefully some of you have started your holidays and can enjoy this slightly longer puzzles and videos!

Link to Play Along:

4 Calling Birds by Will Power http://tinyurl.com/SudokuSleuth4CallingBirds

Rules:

Normal Sudoku rules apply.

RENBAN (3 birds' bodies)- Numbers on purple lines are each a set of non-repeating, consecutive numbers, in any order.

DUTCH WHISPERS (birds' beaks)- Numbers on red lines are at least 4 apart from their neighbors on the line.

ENTROPY LINE (1 bird's body)- Each continuous set of three numbers on a blue line contains one low digit (1-3), one middle digit (4-6) and one high digit (7-9). Numbers do not repeat on red or blue lines.

KILLER- Numbers in cages sum to the number in the top left corner of the cage.

KROPKI PAIRS- Numbers with a black dot between them are in a ratio of 2:1. Not all possible dots are given.