This Is No Fruit Fly.

Riddle: When there is a fly near our food it is normally a pest. But when we see this fly near food it is often a welcome guest. What am I?

Answer: A butterfly.

Source: https://www.riddles.com/2725

When there is a fly near our food it is normally a pest. But when we see this fly near food it is often a welcome guest. What am I? — This is no fruit fly. by Socialmorais v1.

Riddle: When there is a fly near our food it is normally a pest. But when we see this fly near food it is often a welcome guest. What am I? Answer: A butterfly. — by Socialmorais v2.