Rashi on Leviticus 11:42/רש"י על ויקרא י״א:מ״ב

1‎גחון‎ 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.

2כל הולך EVERYTHING THAT GOETH — The word “everything” is employed to include worms and whatever is similar to anything similar to it (Sifra, Shemini, Chapter 12 2).

3הולך על ארבע THAT GOETH UPON ALL FOUR — This is the scorpion (Sifra, Shemini, Chapter 12 2).

4כל EVERYTHING [THAT GOETH UPON ALL FOUR] — The word “everything” is intended to include the beetle, — escarbot in O. F. — and whatever is similar to anything similar to it (Sifra, Shemini, Chapter 12 2).

5מרבה רגלים [AND] WHAT HATH MANY FEET — This is the centipede (Sifra, Shemini, Chapter 12 2) — an insect which has feet from its head to its tail on both sides of its body, and it is called centpies in old French