Birds' beaks are an important part of their anatomy, as they are used for feeding, grooming, and even communication. The two crossword solutions for the term 'birds' beaks' are BILLS (5 letters) and NEBS (4 letters). BILLS is a term used to refer to the beaks of certain types of birds, such as ducks, geese, and swans. NEBS is another term used to describe the beaks of other types of birds, such as parrots, toucans, and hummingbirds.