Leviticus 11:46 pretty much is stating like a general law that applies to all the animals, birds, living creatures in the waters, and every creature that creeps on the earth. Again, God is mentioning about creatures that creep on the earth! I'm thinking right now that God is putting His perspective on us and possibly informing that those creatures that creep on the earth might not be good for our bodies.
Verse 47 sums it up by stating that the children of Israel are to "distinguish between the unclean and the clean, and between the animal that may be eaten and the animal that may not be eaten." I think this verse is implying something like God gave us a smart enough brain and conscience to know if we are going to obey Him or not. It's like God gave His people a responsibility to exercise discernment and to be aware of His laws. This spiritual discernment from God is being made available from reading the Bible. Even though I'm not doing much with the Bible each day from having a busy schedule, it's really helping me a lot so far.