Actually, this has already been recorded. For example, what does the worm in Wolf, Worm, Tiger and Leopard mean? It's confusing. Looking forward to the origin of "wolves, insects, tigers and leopards", it turned out to be in the jade comb of the Ming Dynasty. "Turning this hillside, a cluster of Yulin is dark, and I don't know what wolves, insects, tigers and leopards are hidden inside." Don't jump to conclusions easily. Before the Ming Dynasty, the word "worm" was very particular.
At the end of Yuan Dynasty and the beginning of Ming Dynasty, a novel named Water Margin was published. In the book, when Song Wu and Li Kui jy killed the tiger, they both explicitly called the tiger a big bug. Looking up ancient books, the concept of "Five Insects" originated from "Dai Dai Li Ji".
There are 360 species of feather worms recorded in Li Ji, and the phoenix is the longest. Caterpillar 360, unicorn long; There are 360 beetles, turtles are long; There are 360 scale worms, and the dragons are long; Worm 360, sage grows. Animals are clearly divided into five categories: feather insects, scale insects, Mao Mao, beetles and snails.
Worms without feathers and scales are called worms, also called worms. According to the biological division of the ancients, people are originally a kind of "worm", not a detached species.
As far as the word "insect" is concerned, ancient people often use it to represent all animals in nature, and divide insects into five categories: birds are feather insects, animals are caterpillars, turtles are beetles, fish are scale insects, and people are insects.
Combining these different species, they are collectively called "five insects". In fact, in other words, no matter the creatures flying in the sky, the main reptiles on the land or the creatures swimming in the water, as long as they have no shells and scales as protection, they are called "naked insects".
So as far as tigers are concerned, it is not surprising that people at that time called them "big worms".