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In page Drosophila:

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The larvae of at least one species, D. suzukii, can also feed in fresh fruit and can sometimes be a pest.[5] A few species have switched to being parasites or predators. Many species can be attracted to baits of fermented bananas or mushrooms, but others are not attracted to any kind of baits. Males may congregate at patches of suitable breeding substrate to compete for the females, or form leks, conducting courtship in an area separate from breeding sites.[citation needed]