478 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1907. 
and rounded in some species (such as the blackfish), but in others it 
is shaped like the bill of a snipe. 
The principal food of the cetaceans is fish. Only one species, a dol- 
phin inhabiting the coast of Cameroon, has become herbivorous. A 
large number of cetaceans feed solely on cuttlefish, especially those 
toothed whales in which the teeth are reduced in number, such as the 
sperm whale and bottle-nosed whale. The Ganges dolphin (Plata- 
nista) lives chiefly on small fresh-water crustaceans. The whalebone 
whales are seldom fish eaters, although the common finback and the 
little piked whale are exceptions. The principal food of the whale- 
bone whales consists of minute crustaceans and soft mollusks, which 
A. 
B. 
I'ig. 6.—The American Manatee (Manatus latirostris Harlan). A. View from the right 
side. B. View from below. Length about 3 meters (92 feet). After J. Murie. 
occur in enormous masses in the open sea. The gigantic whales swal- 
low enormous quantities of these little animals. No less than 1,200 
liters (317 gallons) of crustaceans about an inch long have been 
found in the stomach of a sulphurbottom whale. 
That the killer whale is not behind the sharks in point of voracity 
is evidenced by the finding of 13 (young) harbor porpoises and 15 
(young) seals in the stomach of an animal 7.5 meters (244 feet) long, 
all having been swallowed whole, with the exception of one seal, which 
was bitten in pieces. 
