CYGNUS. 
91 
flamingoes ; the one reaching deep water by means 
of lengthened legs, the other being supported on its 
surface by its form and ample plumage. 
Cygnus. — Generic characters . — Bill equally wide 
throughout its length, base elevated, sometimes 
tuberculated, lamina; nearly concealed, nostrils 
medial ; wings long, ample ; legs placed far 
back, short, hallux small, not lobed. 
Types. — C.ferus, Bewickii, fyc. 
Note . — Gregarious in winter ; size large; trachea 
convoluted in the sternum ; cosmopolite. 
