10 BULLETIN 1196, U. S. DEPARTMENT OF AGRICULTURE. 
SUMMARY. 
From this survey of the food of the Holboell grebe it appears 
that though fish formed slightly more than half the sustenance 
of the individuals examined, this fact is of small significance, 
as the species taken are in the main of little commercial value. 
These birds have no special predilection for food fishes valuable to 
man, but are merely in search of something to satisfy hunger, so that 
to them a sculpin is as valuable as a species.considered more edible 
by man. As these common forms of little worth are found in abun- 
dance, they often furnish a ready supply of food. It can not be con- 
sidered, therefore, that this grebe is in any true sense an enemy of 
the fishing industry, while it is probable that, when more material is 
available for the summer months, when the birds are in the shallow 
fresh-water inland lakes, insects and crustaceans will be found to 
furnish a much larger proportion of the food than is indicated above. 
GEE 
LZ LEELA 
7iphive 
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Fig. 3.—Horned grebe. BI63IM 
A. C. Bent ® records that at this season in the lakes of Manitoba the 
birds eat crawfishes, water dogs or salamanders, and aquatic insects. 
HORNED GREBE. 
(Colymbus auritus.) 
‘The horned grebe (fig. 3), a species of wide distribution in the 
Northern Hemisphere, ranges throughout the whole of the United 
States and much of Canada. It breeds south as far as the northern 
portion of the United States and migrates in fall and winter to 
Florida, Louisiana, and southern California. Winter records from 
the interior are mainly from the Great Lakes region, as at this season 
these birds range more commonly along the coasts. 
3 Life histories of North American diving birds, Bull. 107, U. S. Nat. Mus., p. 14, 1919. 
