...When cicadae, crickets, and frogs unite, their music may be heard at the distance of a quarter of a mile... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...Though the water contained in them has a slimy and greenish appearance, and is well populated with frogs, it is by no means unpalatable...
Henry M. Stanley 「How I Found Livingstone」
...About a mile from this place I heard a loud and confused noisesomewhere to the right of my course, and in a short time washappy to find it was the croaking of frogs, which was heavenlymusic to my ears...
Mungo Park 「Travels in the Interior of Africa, Vol. 1 [of 2]」
...At daybreak he reached some shallow pools full of large frogs, which so frightened his horse that he was obliged to keep them quiet by beating the water till he had drank...
W.H.G. Kingston 「Great African Travellers」
...The frogs kept up an incessant chorus, reminding me of the summer evening melodies of my native land, yet as distinct from those as are the human languages of the two countries...
Horatio Bridge 「Journal of an African Cruiser」
...The birds now took the place of the frogs in nature's orchestra, and cooed, peeped, chattered, screamed, whistled, and sang, according to their various tastes and abilities...
Horatio Bridge 「Journal of an African Cruiser」
...The smell is, however, fetid and offensive, and hence toads areless exposed to the attacks of carnivorous animals and of birdsthan frogs, in which such glands do not exist...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...They are also less herbivorous in their diet,eating frogs, lizards, crabs and insects, as well as vegetables andfruit...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...This food consists of green corn, grapes and other fruits, fish, frogs, clams, birds and their eggs and they are also fond of poultry...
Elmer Harry Kreps 「Science of Trapping」
...Living frogs in small cages or aquaria; living toads;some pungent liquid, as ammonia...
Worrallo Whitney 「A Guide for the Study of Animals」
... Cottonmouths observed by me retained a strong hold on fish, frogs, and sometimes mice, but almost always released large mice and baby chicks, which were not eaten until after death...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...I have occasionally offered tadpoles and frogs to cottonmouths, but only the frogs were accepted...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The high percentage of cottonmouths infested with flukes is indicative of the use of frogs as a major source of food...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...This preference is correlated with increased nocturnal activity of frogs and reptiles that constitute the principal food supply...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Generally, cottonmouths retain their hold on fish or frogs but release mice and larger prey after delivering a bite...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
... Shellfish, frogs,...
John Albert Leach 「An Australian Bird Book」
...Fish, frogs, yabbies, insects...
John Albert Leach 「An Australian Bird Book」
...Fish, frogs...
John Albert Leach 「An Australian Bird Book」
...A low-flying hunter of insects, snakes and frogs...
Frank M. Chapman 「What Bird is That?」
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