![]() Rictal bristles: These are small, stiff feathers at the base of a bird's bill.On some birds, the nail can be a different color than the rest of the bill. It is not at the base of the bill and is not as large as a basal knob. Nail: The nail is the stiff, swollen tip of the bill on many ducks and waterfowl, and is used for foraging.The cere typically conforms to the shape of the bill and may cover the nares as well. Cere: The cere is a fleshy, skin-like covering at the base of a bird's bill, but does not swell up to the same extent as a basal knob.The basal knob, on the other hand, has no holes. While the nares may be slightly swollen with illness or injury, they are not basal knobs. Nares: These are a bird's nostrils, the holes on the bill that are used for breathing.Frontal shields can be slightly swollen but without the extreme shape of the basal knob. Frontal shield: This is a small, relatively flat plate that protects a bird's forehead, but it is not swollen and usually is not as large or prominent as a basal knob.The snood can also change color, size, and shape with a turkey's emotion. Snood: This long, dangling protuberance is only found on wild turkeys and ocellated turkeys, and is much longer, thinner, and more flexible than basal knobs.Wattles may also extend onto the lores or around the bird's eyes, but the basal knob does not. Wattles: These fleshy nodules or bumps are usually much smaller than basal knobs and are typically found in groups, while the basal knob is a single structure.The Spruce Home Improvement Review Board.
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