RULE: Ancient Murrelet

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

IF
What color was the UNDERSURFACE of the wing as seen in flight = {Light} OR {Unknown} AND
What SIZE was the TAIL = {Very short} OR {Short} OR {Medium} OR {Unknown} AND
What colour was the SIDE = {White, or pale (grayish-white)} OR {Gray, or blue-gray} OR {Black, purple, or dark} OR {Unknown} AND
<What colour was the BACK> = {Gray, or blue-gray} OR {Black, purple, or dark} OR {Unknown} AND
What colour was the BELLY = {White, or pale (grayish-white)} OR {Unknown} AND
What colour was the BILL = {White, or pale (grayish-white)} OR {Yellow} OR {Orange, buff (orange-yellow), or tan} OR {Olive (yellowish-green)} 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 {Hooked} OR {Unknown} AND
<What LENGTH was the BILL> = {Very short} OR {Short} OR {Medium} OR {Unknown} AND
What colour were the EYES = {Brown or blackish brown} OR {Black or dark gray} OR {Unknown} AND
What was the predominant colour of the HEAD = {Black, purple, or dark} OR {Unknown} AND
<How BIG was the bird> = {Sparrow-sized} OR {Robin-sized} AND
<What TYPE of bird was seen> = {Gull-like, or a Seabird} OR {Duck or Goose-like} AND
<What type of ENVIRONMENT was the bird seen in> = {Saltwater marsh or wetland} OR {Flat saltwater shore; beach} OR {Rocky saltwater shore; cliff} OR {Open ocean; beyond sight of land} OR {In flight over freshwater} OR {In flight over saltwater} AND
<WHERE was the bird seen> = {Southwestern United States} OR {Northwestern Canada or United States}
THEN
Ancient Murrelet (Confidence: 5)