Leviticus 11:21 "Yet these you may eat of every flying creeping thing"

The Torah describes the flying insects that use four legs for walking, as non-kosher. Only those with the special signs - knees extending above their feet, using these longer legs to hop on, are allowed to be eaten.

We are commanded to check for these signs before eating these grasshoppers. Today, we are unable to determine which grasshoppers are kosher and which are not.