RULE: Whooper Swan

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

IF
Was the bird seen in ALASKA = {Yes} AND
What colour were the LEGS or FEET = {Blue} OR {Gray, or blue-gray} OR {Black, purple, or dark} OR {Unknown} AND
What colour were the WING TIPS = {White or light gray} OR {Unknown} AND
What colour was the BACK = {White, or pale (grayish-white)} OR {Unknown} AND
What colour was the BREAST = {White, or pale (grayish-white)} OR {Unknown} AND
What colour was the THROAT = {White, or pale (grayish-white)} OR {Unknown} AND
What colour was the NECK = {White, or pale (grayish-white)} OR {Unknown} AND
What colour was the BILL = {White, or pale (grayish-white)} OR {Yellow} OR {Black, purple, or dark} OR {Unknown} AND
<What SHAPE was the BILL> = {Flattened} OR {Unknown} AND
<What LENGTH was the BILL> = {Medium} AND
What was the predominant colour of the HEAD = {White, or pale (grayish-white)} OR {Unknown} AND
<How BIG was the bird> = {Goose-sized} OR {Larger than a goose} AND
<What TYPE of bird was seen> = {Duck or Goose-like} AND
<WHERE was the bird seen> = {Northwestern Canada or United States}
THEN
Whooper Swan (Confidence: 1)