Which insect is the most successful pollinator of flowers?

The most successful pollinator of flowers is the bee.

Bees are important pollinators of many crops and flowers, and play a vital role in maintaining the biodiversity of many ecosystems. They are highly efficient at transferring pollen from one flower to another, which is essential for the fertilization of plants and the production of seeds and fruit.

Other insects, such as butterflies, moths, and flies, also play important roles in pollination, but bees are generally the most efficient and effective.