Now that we know why certain critters were considered not kosher, why do Jews still go by the old rules?
For instance, pig meat can contain trycnosis (too lazy to look it up)
Thats what killed some of the Arctic explorers. They ate Polar bear meat.
At certain times of the year, oysters are dangerous to eat. So are clams, but I know of no good reason to not eat Lobster. They are scavengers, but so are chickens.