The Blue-footed Booby is a bird that resembles a long winged seagull. The Blue-footed Booby is on average 32 in long and weighs 3.3 lb, with the females slightly larger than the males. It has long pointed wings and a wedge shaped tail. They have strong, thick necks. The booby's eyes are placed on either side of their bill and oriented towards the front. They have excellent binocular vision. The Blue-footed Booby's eyes are yellow. The male has more yellow on its iris than the female. The Blue-footed Booby has permanently closed nostrils made for diving. They breathe through the corners of their mouths. Their feet range from a pale turquoise to a deep aquamarine. Males and younger birds have lighter feet than females do.