The theory of reincarnation is an absolute lie and deception. There is nothing like reincarnation. God created humans and other creature in their respective natures. It is in this nature that they all will be judged by their Creator (that is if God will judge other creatures outside humans). So, it is with the nature which God created you that you will live on earth and fulfil your destiny. You will not need to become any other creature before attaining perfection. Your perfection can only be attained at the state and nature which God created you. Everything that you are doing now will be brought into judgement by God.
Perfection is not by becoming an animal and existing in that form for some years. That is a cruel deception from the pit of hell. To attain perfection, we need to obey what we are taught in the word of God. The word of God is the only manuscript for our perfection. It is when we have done what we have been taught in the commandments of God that we can be perfect. It is true that without perfection we will not enter the kingdom of God. Let us follow what we are learning in the word of God. The Bible is the manuscript to follow if we want to be righteous before God. There is nothing like reincarnation. It is once that God has appointed for a man to die. After that once dead, it will be judgement. There is nothing like reincarnation.