I've read many stories of ants being inmune to microwave, and also of coakroches being very resistive to X-rays and heavy radiation. My first thought was that ants have little water content, but that doesnt sound right because most animal have plenty of water. So instead I maybe wondered that because ants are smaller than the standing waves, it 'skips' the ant. But again, this doesnt sound right because water molecules are definitely smaller and get heated up by the waves. So anybody knows the actual reason?