The gadfly is an insect (similar to a bee). It is bigger than a bee and slightly smaller than a cicada. It feeds on blood and bites people and livestock, especially cattle.

There is also a world famous book Danny Neo, which introduces the Italian revolutionary struggle in the19th century.

Implicitly, it refers to a person who squeezes others' achievements by squeezing to survive, which is similar to the story of "vampire, leech ……" and "Zhou skinned" bullying others.

Extended data:

The habit of the gadfly:

In the complex and diverse nature, Tabani birds like to concentrate in places near water and with high temperature. Paddy fields, swamps, reed pits, running water and still water are ideal environments for their reproduction. They often concentrate their eggs on the leaves of plants such as Gramineae in water. As soon as the larvae hatch, they fall into the water, live underwater and swim to the shore when they pupate.

Larvae are rare, terrestrial, usually aquatic or semi-aquatic and spindle-shaped. Except for a small head, it is 1 1. Each part has a raised ring for movement and a breathing tube at the end. Eat meat, prey on small animals

Reference materials? Baidu encyclopedia gadfly