The duck is one of the greatest known enemies of the mosquito, and therefore of yellow fever and malaria. It has possibly one of the widest geographical ranges of any of the birds. It is even found in the Arctic and Antarctic regions; also in Australia, where bird life is so peculiar.
After trying the ability of fish to devour larvae and pupae of mosquitoes, with varied success, I built two dams near together on the same stream, so that each would have the same environment for the breeding of mosquitoes. Each covered nearly 1,400 square feet. In one, twenty mallard ducks, Anas platyrhynchos, were permitted to feed, while the other was entirely protected from water fowl, but well stocked with goldfish, Carassius auratus, variety americanus.
The one in which the ducks fed was for several months entirely free from mosquitoes, while the pond protected from ducks and stocked with
DIXON SG. THE DUCK AS A PREVENTIVE AGAINST MALARIA AND YELLOW FEVER. JAMA. 1914;LXIII(14):1203. doi:10.1001/jama.1914.02570140057018
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