The Relation of Mollusks to Fish in Oneida Lake 235 
Colymbus auritus Linnaeus. Horned Grebe. 
The food of this grebe is stated to be as follows (McAtee, 
2912,,.p- 19): 
BRE tin COlenyeaqguaticl e.g js. cvycl. sper tin.aeeiee 23.3 per cent. 
Other insects (including aquatic bugs, caddis-fly and 
chironomid larvie, dragon fly nymphs, ete.) ........ 12.0 per cent. 
MrSEME, TeE ose iS Less J.) SHE Moot b ek Oot. ek 27.0 per cent. 
PRTC se os gk} cp eh gk od 4 LE Men ot alo kqept wie 20.7 per cent. 
“LUIGI? (ORR TENG ET Na ae: aaa ee en ae eee eh Aas Rien eae 13.8 per cent. 
Other matter is eaten, including snails and spiders, and a 
small quantity of vegetable food. 
Bartramia longicauda (Bechst). Upland Plover; and 
Oxyechus vociferus (Linn). Willdeer. 
Both of these birds include snails in their diet (McAtee 
and Beal, p. 16). 
Agelaius phoeniceus phoeniceus (Linn). Red-winged Black- 
bird. 
This species has been observed to eat Planorbis (Allen, 
1914, p. 115). This is not surprising as the nests are built 
over the water in marshes where Planorbis and other easily 
obtained snails live. 
Reference is made in Eaton’s “ Birds of New York” to 
the presence of mollusks in the stomach of certain water 
birds, but as the references are not specific they are not 
quoted here. The crow, grackles, and other land birds eat 
snails to a greater or less degree but there are no specific 
records of the use of fresh-water snails. The crow eats dead 
animal matter thrown upon the shore by wind or waves, and 
this may include dead mussels or other mollusks, but there 
is no evidence that it catches or eats living mussels as the 
same species is recorded to eat sea snails on the coast of Maine 
(Bendire, 1895, p. 408). 
8. Mammats as EnEemirs oF MoLuusks. 
Among the mammals three species are known to feed more 
or less on mollusks — all mussels. These are the Muskrat, 
the Mink, and the Otter. 
