Examples from literature

• I use fruit flies because of their extreme adaptability. 
• In late summer and autumn many specimens of a small fruit fly, known as the "vinegar fly,"make their appearance, attracted by the odor of overripe fruit. 
• One mixture which we use is a mixture which is normally used against the fruit flies which are oftentimes injurious to fruit, particularly in the east and in tropical countries. 
• Professor Morgan, for example, has found a strain of fruit flies whose offspring in cold weather are usually born with supernumerary legs. 
• The fact is, I am working with fruit flies.