Birds' bills are an important part of their anatomy, as they are used for feeding, preening, and other activities. The term 'birds' bills' can refer to three different parts of the bird's anatomy: NIBS, NEBS, and BEAKS. NIBS are the small, pointed projections at the base of a bird's bill. NEBS are the nostrils located at the base of a bird's bill. BEAKS are the hard, curved upper part of a bird's bill. All three of these parts are essential for a bird's survival and play an important role in their daily activities.