Yet these may ye eat of all winged creeping things that go upon all fours, which have legs above their feet, wherewith to leap upon the earth. (ASV)
This seems like a rather careless extrapolation from more familiar four-legged animals, especially given the care in which various animals' extremities were noted earlier in this chapter. If one notices whether hooves are present and whether they are split, then why not also count the legs of grasshoppers?
Saying this passage errs in the number of legs grasshoppers have is absurd - the Israelites ate them raw, do you seriously think they didn't know how many legs they have? The issue is, they didn't count the limbs for jumping as "kara" (legs).
Edit this section to note miscellaneous facts.