194 ANATID^. 
1st of May ; and tliey again appear in September^ when 
immature birds are met with. I have seen flocks of thousands 
in the marisma near the Isla Menor, and_, by the aid of a 
stalking-horse^ managed to shoot five at a shot. Usually 
they are extremely wild and shy, except during actual 
passage, when they alight to rest at the mouths of rivers. 
The note is not unlike that of the Grey Lag Goose {Anser 
cinereus) ; and more than once at night I have mistaken the 
sound for that of these Geese. 
267. Cygnus Musicus, Bechst. The Hooper or Whistling 
Swan. 
Spanish. Cisne. 
This is the only species of Swan which I was able to 
identify in Andalucia, having examined one specimen shot on 
the Guadalquivir below Seville, where they are said in some 
winters to be common. 
The Hooper, in its adult plumage, has the bill yellow, with 
black tip, edges, and nostrils. 
268. Cygnus olor, Linn. Mute Swan. 
Favier says : — " This Swan is tolerably numerous, and seen 
flying over near Tangier in small flights, rarely remaining in 
the vicinity ; but they did stay in 1845 and 1849. They 
pass south in December, returning in April." 
The distinguishing mark of the adult birds is the black 
tubercle on the upper part of the orange-coloured bill. 
Family Anatid^e. 
269. Anser cinereus, Meyer. The Grey Lag Goose. 
Moorish. Wiz. Spanish. Ganso, Anser. 
The above names equally apply to A. segetum. 
Favier^s notes are the same for both this and the following 
species, viz. : — " This Goose, which the Arabs confound with 
Anser segetum, is as numerous as that bird near Tangier, 
arriving during November and December. They retire north 
