The nares, or nostrils, open anteriorly at the tip of the snout. Boas lose weight and may develop clogged nares (nostrils), stomatitis, or secondary pneumonia. They do not have external nares (nostrils) and breathe solely through their epiglottis. Most species of birds have external nares (nostrils) located somewhere on their beak. These were mistaken by Brown for the real nares or nostrils. The upper mandible, including the nares and nasal groove, is covered with bristles. Most can be removed through anterior nares. Sounds are generated by passing air from the bony nares through the phonic lips. Intubation is often required until nares are patent. The external nares are found on the tip of the rostrum. "Desmatosuchus" also had very thin vomers, which bounded the medial side of the internal nares. Nasoral grooves are present, connecting the external nares to the mouth. Other synapomorphies of Eusauropoda includes a retracted position of the external nares. Some pugs are also born with stenotic nares which can also inhibit their breathing. There are well-developed, triangular flaps of skin in front of the nares.