RULE: Cassin's Kingbird

<Question>
Match
{Variable}
Direct Choice
{Variable}
Infered Choice

IF
What SIZE was the TAIL = {Short} OR {Medium} OR {Long} OR {Unknown} AND
What SHAPE was the TAIL = {Square or slightly notched at the end} OR {Rounded at the end} OR {Unknown} AND
What colour TAIL PATTERN was there if any = {None} OR {Unknown} AND
What colour was the TAIL = {Brown, brownish red, cinnamon} OR {Gray, or blue-gray} OR {Black, purple, or dark} OR {Unknown} AND
What colour was the BACK = {Olive (yellowish-green)} OR {Brown, or chestnut (reddish-brown)} OR {Gray, or blue-gray} OR {Black, purple, or dark} OR {Unknown} AND
What colour was the BELLY = {Yellow} OR {Unknown} AND
What colour PATTERN if any was shown on the BREAST = {Uniform color} OR {Unknown} AND
What colour was the BREAST = {Yellow} OR {Gray, or blue-gray} OR {Unknown} AND
What colour was the THROAT = {White, or pale (grayish-white)} OR {Gray, or blue-gray} OR {Unknown} AND
What SHAPE was the BILL = {Straight and slender} OR {Straight and thick} OR {Conical and slender} OR {Unknown} AND
What LENGTH was the BILL = {Very short} OR {Short} OR {Medium} OR {Unknown} AND
What FACIAL or HEAD features were noted if any = {Dark area near the eye} OR {NONE or a PLAIN unmarked FACE} OR {Unknown} AND
What colour was the TOP of HEAD = {Orange, buff (orange-yellow), or tan} OR {Red, or pink} OR {Gray, or blue-gray} OR {Black, purple, or dark} OR {Unknown} AND
What was the predominant colour of the HEAD = {Gray, or blue-gray} OR {Black, purple, or dark} OR {Unknown} AND
How BIG was the bird = {Sparrow-sized} OR {Robin-sized} AND
<What TYPE of bird was seen> = {Songbird} AND
WHEN was the bird seen = {Spring} OR {Summer} OR {Fall} AND
WHERE was the bird seen = {Southwestern United States} OR {Northwestern Canada or United States}
THEN
Cassin's Kingbird (Confidence: 4)