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Drosophila melanogaster  is widely used as a model organism for biological investigations, and food is a major aspect of its ecology and evolutionary biology. Previous studies have shown that this insect can use fruits, yeasts and insect carcasses as its food sources. In this study, we demonstrate that this species is an omnivore, that its larvae can exploit not only fruits and yeast but also foods of animal origin (FAOs), and that larvae consume adult carcasses regularly. FAO-fed larvae develop into adulthood within a normal developmental time frame without the help of microbes. Yeast foods are better for  Drosophila  development than are foods of plant origin (FPOs) or FAO because in yeast foods, more eggs complete their life cycle, and the body size of emerged flies is much greater. Flies can use a mixture of yeast-FAO, which significantly boosts female fertility. Larvae digest FAOs externally. Larval  D .  virilis ,  D .  hydei , and  D .  simulans  are also omnivorous and demonstrate the same feeding habits as larval  D .  melanogaster . These findings prompt us to reconsider previous conclusions about the original adaptations of  D .  melanogaster  and other  Drosophila  species and have direct implications for diet-related studies using  Drosophila  as a model organism.

Carnivory in the larvae of Drosophila melanogaster and other Drosophila species