RULE: Gyrfalcon

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

IF
How was the bird SEEN BEST = {In flight} AND
What SHAPE were the wings = {Pointed} OR {Unknown} AND
What SIZE was the TAIL = {Medium} OR {Long} OR {Very 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 was the BACK = {White, or pale (grayish-white)} OR {Brown, or chestnut (reddish-brown)} OR {Gray, or blue-gray} OR {Black, purple, or dark} OR {Unknown} AND
<What SHAPE was the BILL> = {Straight and thick} OR {Hooked} OR {Downcurved} OR {Unknown} AND
<What LENGTH was the BILL> = {Very short} OR {Short} OR {Unknown} AND
How BIG was the bird = {Pigeon-sized} OR {Crow-sized} OR {Goose-sized} AND
<What TYPE of bird was seen> = {Hawk-like} AND
WHERE was the bird seen = {Northeastern Canada or United States} OR {Northwestern Canada or United States}
THEN
Gyrfalcon (Confidence: 1)