I was surprised to read in this article the explanation, “Those low-pressure swirls create suction that pulls the insect upward.” There is no physical force known as “suction.” As the article correctly states, the leading-edge wing vortices create a low-pressure zone above the wings, and the higher-pressure air under the insect’s wings pushes the insect up.

Gary J. Grzebienik
Clawson, Mich