DIPTEROUS flies of the genus Protocalliphora belong- to the Calliphoridae, a family in which most species are carrion-feeders. In this genus the larvae are ecto-parasites of nestling birds. The adult flies lay eggs in birds' nests and when the larvae hatch they periodically attach themselves, by means of a suction pad on the first segment, to some part of a nestling and suck its blood. W h e n full...

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