Neb
One possible three-letter word for "bill" would be "IOU." Another might be "neb," which is a bird's bill.
Another name for a owl's beak is called a bill or rostrum.
I would assume that the whippoorwill's bill is the same as other birds'... a NIB.
NIB
neb
Dun
yes all birds have a beak or a bill
The serial number and most times the letter on the bill.
Marshy birds
yes all birds have a beak or a bill
Bill is made up of keratin protein .
Three distinguishing characteristics of birds are feathers, which provide insulation and enable flight; a beak or bill, adapted for their specific feeding habits; and a lightweight skeletal structure that includes hollow bones, allowing for efficient flight. Additionally, most birds lay hard-shelled eggs, which protect their developing young. These traits collectively enable birds to thrive in a variety of environments.