THE ALIMENTARY CANAL. 83 
their diet, being greatest in those living on grain and fruit. 
The gullet corresponds in length with the neck, which is 
longest in the long-legged tribes, and in width with the 
food. In those that swallow large fish entire, the gullet is 
dilatable, as in Snakes. In nearly all Birds, the food is 
delayed in some cavity before digestion: thus, the Pelican 
has a bag under the lower jaw, and the Cormorant has a 
capacious gullet, where they store up fishes; while these 
that gorge them- 
selves at inter- 
vals, as the Vult- 
ure, or feed on 
seeds and grains, 
as the Turkey, 
have a pouch, 
called the crop, 
developed near 
the lower end of 
the gullet.” The 
Ostrich, Goose, 
Swan, most of 
the Waders, and 
the fruit or in- 
sect eating birds, HY 
which find their 
LU 
4 Fig. 47.—Stomach of the Crocodile: a, muscular fibres 
food 1n tolerable radiating from a central tendon, b; d, commencement 
of duodenum ; ¢, esophagus; f, intestine. 
abundance, and 
take it in small quantities, have no such reservoir. Pig- 
eons have two crops. 
In all Birds, the food passes from the gullet into the 
proventriculus, or stomach proper, where it is mixed with 
a “oastric juice” secreted from glands on the surface. 
Thence it goes into the gizzard, an oval sac of highly 
muscular texture, and lined with a tough horny skin.” 
The gizzard is most highly developed, and of a deep-red 
