Both sexes have orange feet and a blue speculum , or wing-patch, bordered in white on two sides, best seen in flight.
An instrument called a speculum , the same as used for a smear test, is sometimes used.
The latter is important because dabbling ducks have a coloured area in the wing called the speculum .
Using a nasal speculum , your doctor may look inside your nose for signs of allergic disease such as increased nasal secretions, swelling or polyps.
The surgeon uses a wire speculum to retract the eyelids to expose the eyeball.
Your eyelids will be opened up using a small instrument called a speculum .
With the headlight and speculum the external auditory canal is inspected and cleared of any obstructing wax or debris.
Females with unpatterned dark bills, an overall dark brown body colour, and a violet speculum with only the trailing edge with white were considered American Black Ducks.
He made his mirrors from speculum metal - four parts copper to one part tin - but had to construct a forge to melt the speculum and cast the disc from which the mirror could be ground.
Both sexes have a black and white wing-patch, or speculum , that is distinctive in flight.