So, “Come out from among them and be separate, says the Lord. Do not touch anything that is not pure and ‘clean.’ Then I will receive you.” (Isaiah 52:11; Ezekiel 20:34,41)
Some animals only chew the cud. Others only have a divided hoof. The camel, rabbit and rock badger chew the cud, but they don’t have a divided hoof. So you can’t eat them. They are not “clean” for you.