RULE: Ross' Gull

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

IF
What colour were the LEGS or FEET = {Orange, buff (orange-yellow), or tan} OR {Red, or pink} OR {Rufous (dull-red or rust-colored)} OR {Unknown} AND
<What SHAPE was the TAIL> = {Pointed or wedge-shaped} OR {Unknown} AND
What colour was the BACK = {White, or pale (grayish-white)} OR {Gray, or blue-gray} OR {Unknown} AND
What colour was the BREAST = {White, or pale (grayish-white)} OR {Red, or pink} OR {Unknown} AND
What colour was the BILL = {Black, purple, or dark} OR {Unknown} AND
<What SHAPE was the BILL> = {Straight and thick} OR {Hooked} OR {Unknown} AND
<What LENGTH was the BILL> = {Short} OR {Medium} OR {Unknown} AND
What colour was the TOP of HEAD = {White, or pale (grayish-white)} OR {Unknown} AND
How BIG was the bird = {Robin-sized} OR {Pigeon-sized} AND
<What TYPE of bird was seen> = {Gull-like, or a Seabird} AND
<WHERE was the bird seen> = {Northeastern Canada or United States} OR {Northwestern Canada or United States}
THEN
Ross' Gull (Confidence: 1)