פירוש על ויקרא 11:42

‎גחון‎ הולך על THAT GOETH ON THE BELLY — This is the serpent (Sifra, Shemini, Chapter 12 2; Chullin 67b), and the expression גחון denotes bending low, so that the phrase means: that which walks bent down and fallen upon its belly.

Worms. These are the long worms that come out of the ground that have no legs, found in garbage, and especially in the summer days after the rain stops.

Regarding all creeping creatures that crawl on the ground. The Torahs prohibits eating types of tiny insects that were born in seeds or fruit after they went out from the fruit and crawled on the ground. The same applies when they originated inside the fruit while it was still [attached to the tree that is] connected to the ground, even if they never went out from the fruit and crawled on the ground, they are called a creature that crawls on the ground, since they were formed in a fruit while it is connected to the ground. However, those small insects that are born inside seeds or something after it has been picked, for example, in types of fruits, rice, or flour, are prohibited by rabbinic law because they were concerned that perhaps they crawled upon the ground or on the walls of the vessel.