Birds that claw their prey are not kosher, though there are other signs too, of course. Plus, how the bird sits on a line with its “toes” divided across the line is an indication of a possibly kosher bird. A bird that catches another bird in the air – not kosher. Also, which birds does the bird under question dwell among? Plus – grasshoppers! To be kosher, the legs, the hopping, and the name of the creature need to be in line with the kosher requirements. Each type of kosher grasshopper is described as “according to its kind,” in the Torah’s presentation of them. Plus, the organization of the generalizations and specifications in the Torah makes a difference as well — regarding the traits that are required for a grasshopper to be kosher. The common traits matter – even in comparison to the specifics that might apply to a given species.